Merge commit '1483a3ddfe74e4fb81d87447a1781943eab86c60' into glitch-soc/merge-upstream

Conflicts:
- `config/initializers/simple_form.rb`:
  Upstream added a new simple_form component, where we had an extra one.
  Kept both components.

app/serializers/rest/list_serializer.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 class REST::ListSerializer < ActiveModel::Serializer
-  attributes :id, :title, :replies_policy
+  attributes :id, :title, :replies_policy, :exclusive
 
   def id
     object.id.to_s