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

Conflicts:
- app/controllers/accounts_controller.rb
- app/controllers/follower_accounts_controller.rb
- app/controllers/statuses_controller.rb

All conflicts caused by the additional `use_pack` used for glitch-soc's theming
system.

app/serializers/activitypub/flag_serializer.rb

@@ -5,7 +5,6 @@ class ActivityPub::FlagSerializer < ActiveModel::Serializer
   attribute :virtual_object, key: :object
 
   def id
-    # This is nil for now
     ActivityPub::TagManager.instance.uri_for(object)
   end