Merge branch 'main' into glitch-soc/merge-upstream

Conflicts:
- `CONTRIBUTING.md`:
  Not a real conflict, glitch-soc quotes the upstream file, which has been
  changed. Update the quote.

app/lib/sanitize_config.rb

@@ -28,9 +28,9 @@ class Sanitize
       return unless class_list
 
       class_list.keep_if do |e|
-        next true if e =~ /^(h|p|u|dt|e)-/ # microformats classes
-        next true if e =~ /^(mention|hashtag)$/ # semantic classes
-        next true if e =~ /^(ellipsis|invisible)$/ # link formatting classes
+        next true if /^(h|p|u|dt|e)-/.match?(e) # microformats classes
+        next true if /^(mention|hashtag)$/.match?(e) # semantic classes
+        next true if /^(ellipsis|invisible)$/.match?(e) # link formatting classes
       end
 
       node['class'] = class_list.join(' ')