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

Conflicts:
- `app/views/admin/settings/appearance/show.html.haml`:
  Upstream enforced an uniform code style around lambdas, and glitch-soc
  had a different lambda due to its theming system.
  Applied the same code style changes.
- `app/views/settings/preferences/appearance/show.html.haml`:
  Upstream enforced an uniform code style around lambdas, and glitch-soc
  removed some code just after the lambda.
  Applied the same code style changes.

app/controllers/api/v1/tags_controller.rb

@@ -19,6 +19,7 @@ class Api::V1::TagsController < Api::BaseController
 
   def unfollow
     TagFollow.find_by(account: current_account, tag: @tag)&.destroy!
+    TagUnmergeWorker.perform_async(@tag.id, current_account.id)
     render json: @tag, serializer: REST::TagSerializer
   end