pages: add a matrix page

Resolves: #248

pages/matrix.markdown

@@ -0,0 +1,26 @@
+---
+layout: page
+title: '[m]'
+navigation: true
+permalink: /matrix/
+excerpt: "Matrix, a decentralised conversation store"
+---
+
+Just like [IRC](/irc/), *Matrix* has became a part of my social life online. My
+room can be found from [my discuss page](/discuss) alongside
+some protocol comparison and my accounts are in [index](/).
+
+I also have a [txt with list of my accounts](/txt/matrix.txt) which [has SSH signature](/txt/matrix.txt.sig).
+
+### Matrix-related posts
+
+*Note that this section is manually updated and might be missing some
+links.*
+
+* Critique
+    * [Inconsistency issues of Element, Element and Element, also privacy concerns]({% post_url blog/2021-08-03-matrix-perfect-privacy-not %})
+    * [Without selfhosting a homeserver or even then, Matrix moderation tools rely on security through obscurity]({% post_url blog/2021-12-05-matrix-community-abuse-security-by-obscurity %})
+
+* * * * *
+
+*The lucky Matrix number is `{{site.matrixLatestRoomVersion}}`, but do [consult the Spec for that too](https://spec.matrix.org/latest/rooms/#complete-list-of-room-versions).*