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

Conflicts:
- `README.md`:
  Discarded upstream changes: we have our own README
- `app/controllers/follower_accounts_controller.rb`:
  Port upstream's minor refactoring

app/models/media_attachment.rb

@@ -210,6 +210,8 @@ class MediaAttachment < ApplicationRecord
 
   default_scope { order(id: :asc) }
 
+  attr_accessor :skip_download
+
   def local?
     remote_url.blank?
   end