diff --git a/.bundle/config b/.bundle/config
new file mode 100644
index 000000000..236922881
--- /dev/null
+++ b/.bundle/config
@@ -0,0 +1,2 @@
+---
+BUNDLE_PATH: "vendor/bundle"
diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 000000000..616c34e63
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,8 @@
+root = true
+
+[*]
+end_of_line = lf
+trim_trailing_whitespace = false
+insert_final_newline = true
+charset = utf-8
+indent_style = space
diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 000000000..6313b56c5
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1 @@
+* text=auto eol=lf
diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 000000000..e3124a079
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,21 @@
+version: 2
+updates:
+  - package-ecosystem: "bundler"
+    directory: "/"
+    schedule:
+      interval: "daily"
+      timezone: "Europe/Helsinki"
+    groups:
+      bundler:
+        patterns:
+          - "*"
+
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"
+      timezone: "Europe/Helsinki"
+    groups:
+      github-actions:
+        patterns:
+          - "*"
diff --git a/.github/workflows/html5validator.yml b/.github/workflows/html5validator.yml
new file mode 100644
index 000000000..1e617b3dd
--- /dev/null
+++ b/.github/workflows/html5validator.yml
@@ -0,0 +1,25 @@
+name: HTML5 Validator
+
+on:
+  push:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4 # Required will all actions
+
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 3.1
+          bundler-cache: true # runs 'bundle install' and caches installed gems automatically
+
+      - name: Jekyll build
+        run: |
+          bundle exec jekyll build --drafts --profile
+
+      - name: Checks HTML5 validity
+        uses: Cyb3r-Jak3/html5validator-action@v7.2.0
+        with:
+          root: _site/
+          blacklist: n r or ir
diff --git a/.gitignore b/.gitignore
index 57eb6393c..4017788c3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -26,3 +26,4 @@ test-logs/
 src/version.py
 _site
 .sass-cache
+vendor/
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
new file mode 100644
index 000000000..0a5648103
--- /dev/null
+++ b/.pre-commit-config.yaml
@@ -0,0 +1,64 @@
+# See https://pre-commit.com for more information
+# See https://pre-commit.ci for more information
+ci:
+  # I don't need so many duplicated notifications on the same thing as I keep
+  # autoupdating manually too. Besides it just creates extra branch I never
+  # touch.
+  # https://github.com/pre-commit-ci/issues/issues/83
+  autoupdate_schedule: quarterly
+
+default_language_version:
+  python: pypy3
+
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.4.0
+    hooks:
+      - id: check-added-large-files
+      - id: check-case-conflict
+      - id: check-yaml
+      - id: check-executables-have-shebangs
+      - id: check-shebang-scripts-are-executable
+      - id: destroyed-symlinks
+      - id: detect-private-key
+      - id: end-of-file-fixer
+      - id: fix-byte-order-marker
+      - id: trailing-whitespace
+        exclude_types: [markdown]
+
+  - repo: https://github.com/pre-commit-ci/pre-commit-ci-config
+    rev: v1.6.1
+    hooks:
+      - id: check-pre-commit-ci-config
+
+  - repo: https://github.com/thlorenz/doctoc
+    rev: v2.2.0
+    hooks:
+      - id: doctoc
+        args: [--update-only, --notitle]
+
+  - repo: https://github.com/python-jsonschema/check-jsonschema
+    rev: 0.27.0
+    hooks:
+      - id: check-dependabot
+      - id: check-github-actions
+      - id: check-github-workflows
+      - id: check-gitlab-ci
+
+  - repo: https://github.com/pre-commit/mirrors-prettier
+    rev: "v3.0.3"
+    hooks:
+      - id: prettier
+        additional_dependencies: [
+            # https://www.npmjs.com/package/prettier
+            "prettier@3.0.3",
+            # https://www.npmjs.com/package/@prettier/plugin-xml
+            "@prettier/plugin-xml@3.2.0",
+          ]
+
+  - repo: https://github.com/editorconfig-checker/editorconfig-checker.python
+    rev: "2.7.2"
+    hooks:
+      - id: editorconfig-checker
+        alias: ec
+        args: [-disable-max-line-length]
diff --git a/.prettierignore b/.prettierignore
new file mode 100644
index 000000000..f15ca4ddf
--- /dev/null
+++ b/.prettierignore
@@ -0,0 +1 @@
+_includes/
diff --git a/Gemfile b/Gemfile
new file mode 100644
index 000000000..e286627e5
--- /dev/null
+++ b/Gemfile
@@ -0,0 +1,6 @@
+source "https://rubygems.org"
+# For now this is a GitHub Pages hosted website.
+#   Ref: https://github.com/Mikaela/mikaela.github.io/issues/153
+gem "github-pages"
+# Required for `bundle exec jekyll serve`
+gem "webrick"
diff --git a/Gemfile.lock b/Gemfile.lock
new file mode 100644
index 000000000..c34b2565d
--- /dev/null
+++ b/Gemfile.lock
@@ -0,0 +1,262 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    activesupport (7.0.8)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 1.6, < 2)
+      minitest (>= 5.1)
+      tzinfo (~> 2.0)
+    addressable (2.8.5)
+      public_suffix (>= 2.0.2, < 6.0)
+    base64 (0.1.1)
+    coffee-script (2.4.1)
+      coffee-script-source
+      execjs
+    coffee-script-source (1.11.1)
+    colorator (1.1.0)
+    commonmarker (0.23.10)
+    concurrent-ruby (1.2.2)
+    dnsruby (1.70.0)
+      simpleidn (~> 0.2.1)
+    em-websocket (0.5.3)
+      eventmachine (>= 0.12.9)
+      http_parser.rb (~> 0)
+    ethon (0.16.0)
+      ffi (>= 1.15.0)
+    eventmachine (1.2.7)
+    execjs (2.9.1)
+    faraday (2.7.11)
+      base64
+      faraday-net_http (>= 2.0, < 3.1)
+      ruby2_keywords (>= 0.0.4)
+    faraday-net_http (3.0.2)
+    ffi (1.16.2)
+    forwardable-extended (2.6.0)
+    gemoji (3.0.1)
+    github-pages (228)
+      github-pages-health-check (= 1.17.9)
+      jekyll (= 3.9.3)
+      jekyll-avatar (= 0.7.0)
+      jekyll-coffeescript (= 1.1.1)
+      jekyll-commonmark-ghpages (= 0.4.0)
+      jekyll-default-layout (= 0.1.4)
+      jekyll-feed (= 0.15.1)
+      jekyll-gist (= 1.5.0)
+      jekyll-github-metadata (= 2.13.0)
+      jekyll-include-cache (= 0.2.1)
+      jekyll-mentions (= 1.6.0)
+      jekyll-optional-front-matter (= 0.3.2)
+      jekyll-paginate (= 1.1.0)
+      jekyll-readme-index (= 0.3.0)
+      jekyll-redirect-from (= 0.16.0)
+      jekyll-relative-links (= 0.6.1)
+      jekyll-remote-theme (= 0.4.3)
+      jekyll-sass-converter (= 1.5.2)
+      jekyll-seo-tag (= 2.8.0)
+      jekyll-sitemap (= 1.4.0)
+      jekyll-swiss (= 1.0.0)
+      jekyll-theme-architect (= 0.2.0)
+      jekyll-theme-cayman (= 0.2.0)
+      jekyll-theme-dinky (= 0.2.0)
+      jekyll-theme-hacker (= 0.2.0)
+      jekyll-theme-leap-day (= 0.2.0)
+      jekyll-theme-merlot (= 0.2.0)
+      jekyll-theme-midnight (= 0.2.0)
+      jekyll-theme-minimal (= 0.2.0)
+      jekyll-theme-modernist (= 0.2.0)
+      jekyll-theme-primer (= 0.6.0)
+      jekyll-theme-slate (= 0.2.0)
+      jekyll-theme-tactile (= 0.2.0)
+      jekyll-theme-time-machine (= 0.2.0)
+      jekyll-titles-from-headings (= 0.5.3)
+      jemoji (= 0.12.0)
+      kramdown (= 2.3.2)
+      kramdown-parser-gfm (= 1.1.0)
+      liquid (= 4.0.4)
+      mercenary (~> 0.3)
+      minima (= 2.5.1)
+      nokogiri (>= 1.13.6, < 2.0)
+      rouge (= 3.26.0)
+      terminal-table (~> 1.4)
+    github-pages-health-check (1.17.9)
+      addressable (~> 2.3)
+      dnsruby (~> 1.60)
+      octokit (~> 4.0)
+      public_suffix (>= 3.0, < 5.0)
+      typhoeus (~> 1.3)
+    html-pipeline (2.14.3)
+      activesupport (>= 2)
+      nokogiri (>= 1.4)
+    http_parser.rb (0.8.0)
+    i18n (1.14.1)
+      concurrent-ruby (~> 1.0)
+    jekyll (3.9.3)
+      addressable (~> 2.4)
+      colorator (~> 1.0)
+      em-websocket (~> 0.5)
+      i18n (>= 0.7, < 2)
+      jekyll-sass-converter (~> 1.0)
+      jekyll-watch (~> 2.0)
+      kramdown (>= 1.17, < 3)
+      liquid (~> 4.0)
+      mercenary (~> 0.3.3)
+      pathutil (~> 0.9)
+      rouge (>= 1.7, < 4)
+      safe_yaml (~> 1.0)
+    jekyll-avatar (0.7.0)
+      jekyll (>= 3.0, < 5.0)
+    jekyll-coffeescript (1.1.1)
+      coffee-script (~> 2.2)
+      coffee-script-source (~> 1.11.1)
+    jekyll-commonmark (1.4.0)
+      commonmarker (~> 0.22)
+    jekyll-commonmark-ghpages (0.4.0)
+      commonmarker (~> 0.23.7)
+      jekyll (~> 3.9.0)
+      jekyll-commonmark (~> 1.4.0)
+      rouge (>= 2.0, < 5.0)
+    jekyll-default-layout (0.1.4)
+      jekyll (~> 3.0)
+    jekyll-feed (0.15.1)
+      jekyll (>= 3.7, < 5.0)
+    jekyll-gist (1.5.0)
+      octokit (~> 4.2)
+    jekyll-github-metadata (2.13.0)
+      jekyll (>= 3.4, < 5.0)
+      octokit (~> 4.0, != 4.4.0)
+    jekyll-include-cache (0.2.1)
+      jekyll (>= 3.7, < 5.0)
+    jekyll-mentions (1.6.0)
+      html-pipeline (~> 2.3)
+      jekyll (>= 3.7, < 5.0)
+    jekyll-optional-front-matter (0.3.2)
+      jekyll (>= 3.0, < 5.0)
+    jekyll-paginate (1.1.0)
+    jekyll-readme-index (0.3.0)
+      jekyll (>= 3.0, < 5.0)
+    jekyll-redirect-from (0.16.0)
+      jekyll (>= 3.3, < 5.0)
+    jekyll-relative-links (0.6.1)
+      jekyll (>= 3.3, < 5.0)
+    jekyll-remote-theme (0.4.3)
+      addressable (~> 2.0)
+      jekyll (>= 3.5, < 5.0)
+      jekyll-sass-converter (>= 1.0, <= 3.0.0, != 2.0.0)
+      rubyzip (>= 1.3.0, < 3.0)
+    jekyll-sass-converter (1.5.2)
+      sass (~> 3.4)
+    jekyll-seo-tag (2.8.0)
+      jekyll (>= 3.8, < 5.0)
+    jekyll-sitemap (1.4.0)
+      jekyll (>= 3.7, < 5.0)
+    jekyll-swiss (1.0.0)
+    jekyll-theme-architect (0.2.0)
+      jekyll (> 3.5, < 5.0)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-cayman (0.2.0)
+      jekyll (> 3.5, < 5.0)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-dinky (0.2.0)
+      jekyll (> 3.5, < 5.0)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-hacker (0.2.0)
+      jekyll (> 3.5, < 5.0)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-leap-day (0.2.0)
+      jekyll (> 3.5, < 5.0)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-merlot (0.2.0)
+      jekyll (> 3.5, < 5.0)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-midnight (0.2.0)
+      jekyll (> 3.5, < 5.0)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-minimal (0.2.0)
+      jekyll (> 3.5, < 5.0)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-modernist (0.2.0)
+      jekyll (> 3.5, < 5.0)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-primer (0.6.0)
+      jekyll (> 3.5, < 5.0)
+      jekyll-github-metadata (~> 2.9)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-slate (0.2.0)
+      jekyll (> 3.5, < 5.0)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-tactile (0.2.0)
+      jekyll (> 3.5, < 5.0)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-time-machine (0.2.0)
+      jekyll (> 3.5, < 5.0)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-titles-from-headings (0.5.3)
+      jekyll (>= 3.3, < 5.0)
+    jekyll-watch (2.2.1)
+      listen (~> 3.0)
+    jemoji (0.12.0)
+      gemoji (~> 3.0)
+      html-pipeline (~> 2.2)
+      jekyll (>= 3.0, < 5.0)
+    kramdown (2.3.2)
+      rexml
+    kramdown-parser-gfm (1.1.0)
+      kramdown (~> 2.0)
+    liquid (4.0.4)
+    listen (3.8.0)
+      rb-fsevent (~> 0.10, >= 0.10.3)
+      rb-inotify (~> 0.9, >= 0.9.10)
+    mercenary (0.3.6)
+    minima (2.5.1)
+      jekyll (>= 3.5, < 5.0)
+      jekyll-feed (~> 0.9)
+      jekyll-seo-tag (~> 2.1)
+    minitest (5.20.0)
+    nokogiri (1.15.4-x86_64-linux)
+      racc (~> 1.4)
+    octokit (4.25.1)
+      faraday (>= 1, < 3)
+      sawyer (~> 0.9)
+    pathutil (0.16.2)
+      forwardable-extended (~> 2.6)
+    public_suffix (4.0.7)
+    racc (1.7.1)
+    rb-fsevent (0.11.2)
+    rb-inotify (0.10.1)
+      ffi (~> 1.0)
+    rexml (3.2.6)
+    rouge (3.26.0)
+    ruby2_keywords (0.0.5)
+    rubyzip (2.3.2)
+    safe_yaml (1.0.5)
+    sass (3.7.4)
+      sass-listen (~> 4.0.0)
+    sass-listen (4.0.0)
+      rb-fsevent (~> 0.9, >= 0.9.4)
+      rb-inotify (~> 0.9, >= 0.9.7)
+    sawyer (0.9.2)
+      addressable (>= 2.3.5)
+      faraday (>= 0.17.3, < 3)
+    simpleidn (0.2.1)
+      unf (~> 0.1.4)
+    terminal-table (1.8.0)
+      unicode-display_width (~> 1.1, >= 1.1.1)
+    typhoeus (1.4.0)
+      ethon (>= 0.9.0)
+    tzinfo (2.0.6)
+      concurrent-ruby (~> 1.0)
+    unf (0.1.4)
+      unf_ext
+    unf_ext (0.0.8.2)
+    unicode-display_width (1.8.0)
+    webrick (1.8.1)
+
+PLATFORMS
+  x86_64-linux
+
+DEPENDENCIES
+  github-pages
+  webrick
+
+BUNDLED WITH
+   2.4.10