Merge commit '5393be7a21331c8615ffb79c2271db92f6959458' into glitch-soc/merge-upstream

Conflicts:
- `app/controllers/auth/registrations_controller.rb`:
  Not a real conflict. Upstream removed the `set_instance_presenter` private
  method from this class, and glitch-soc has an extra private method right
  besides it for the theming system.
  Removed `set_instance_presenter` as upstream did.
- `app/controllers/auth/sessions_controller.rb`:
  Not a real conflict. Upstream removed the `set_instance_presenter` private
  method from this class, and glitch-soc has an extra private method right
  besides it for the theming system.
  Removed `set_instance_presenter` as upstream did.

app/controllers/concerns/account_controller_concern.rb

@@ -9,17 +9,11 @@ module AccountControllerConcern
   FOLLOW_PER_PAGE = 12
 
   included do
-    before_action :set_instance_presenter
-
     after_action :set_link_headers, if: -> { request.format.nil? || request.format == :html }
   end
 
   private
 
-  def set_instance_presenter
-    @instance_presenter = InstancePresenter.new
-  end
-
   def set_link_headers
     response.headers['Link'] = LinkHeader.new(
       [