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

Conflicts:
- README.md
- app/helpers/statuses_helper.rb
  Upstream moved account helpers to their own file, we had extra
  helpers there, moved too.
- app/lib/sanitize_config.rb
- app/models/user.rb
- app/serializers/initial_state_serializer.rb
- config/locales/simple_form.en.yml
- spec/lib/sanitize_config_spec.rb

app/lib/sanitize_config.rb

@@ -50,7 +50,7 @@ class Sanitize
 
       add_attributes: {
         'a' => {
-          'rel' => 'nofollow noopener tag',
+          'rel' => 'nofollow noopener tag noreferrer',
           'target' => '_blank',
         },
       },