systemd-resolved: add DNA/Moi & Elisa DNS servers

I was unable to find authoritative source for what is Telia's DNS

etc/systemd/resolved.conf.d/05-do53-dna-moi.conf

@@ -0,0 +1,5 @@
+[Resolve]
+# https://asiakaspalvelu.moi.fi/hc/fi/articles/360029789832-Mitk%C3%A4-ovat-Moin-palvelinosoitteet
+DNS=2001:14b8:1000::1 2001:14b8:1000::2
+DNS=62.241.198.245 62.241.198.246
+# vim: filetype=systemd

etc/systemd/resolved.conf.d/05-do53-elisa.conf

@@ -0,0 +1,8 @@
+[Resolve]
+# https://elisa.fi/asiakaspalvelu/nettiliittymat/tiedonsiirtoportit-porttiohjaukset/
+# Elisa
+DNS=193.229.0.40 193.229.0.42
+# Saunalahti
+DNS=2001:998:20::20 2001:998:20::40
+DNS=195.74.0.47 195.197.54.100
+# vim: filetype=systemd

etc/systemd/resolved.conf.d/README.md

@@ -33,10 +33,20 @@ sudo systemctl restart systemd-resolved
   there truly is no local resolver, systemd-resolved will detect that and act accordingly.)
   - To rephrase, this is to be used together with other files, especially
     some of those beginning with `10-dot-`.
+- `05-do53-dna-moi.conf` - DNS servers used by DNA and Moi (who is on DNA's
+  network and owned by them)
+- `05-do53-elisa.conf` - DNS servers used by Elisa and apparently their
+  Saunalahti still exists here as well.
 - `10-dot-*.conf` - configuration to use the DNS provider with DNS-over-TLS.
   At least one of these should be used in addition to `00-defaults.conf`
 - `98-local-resolver.conf` attempts to configure localhost resolver and
-  disables unnecessary features for that scenario.
+  disables unnecessary features for that scenario. The number 10 takes
+  priority over 00 and 05 so if a DNSOverTLS=true is uncommented, it will
+  also apply to the former ones that are unlikely to support it. When
+  numbering the files, I didn't think I would be adding the plaintext DNS
+  servers that I am unlikely to use whenever Unbound is available (and I
+  currently have only one system that has systemd-resolved while not having
+  Unbound and it seems to prefer DoT over my router anyway).
 - `99-lan-resolver.conf.sample` when renamed would allow enabling resolvers on
   LAN assuming they are trusted. Note that if used together with
   `98-local-resolver.conf`, DNSSEC would be disabled.