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

Conflicts:
- `README.md`:
  Upstream added a link to the roadmap, but we have a completely different README.
  Kept ours.
- `app/models/media_attachment.rb`:
  Upstream upped media attachment limits.
  Updated the default according to upstream's.
- `db/migrate/20180831171112_create_bookmarks.rb`:
  Upstream changed the migration compatibility level.
  Did so too.
- `config/initializers/content_security_policy.rb`:
  Upstream refactored this file but we have a different version.
  Kept our version.
- `app/controllers/settings/preferences_controller.rb`:
  Upstream completely refactored user settings storage, and glitch-soc has a
  different set of settings.
  The file does not directly references individual settings anymore.
  Applied upstream changes.
- `app/lib/user_settings_decorator.rb`:
  Upstream completely refactored user settings storage, and glitch-soc has a
  different set of settings.
  The file got removed entirely.
  Removed it as well.
- `app/models/user.rb`:
  Upstream completely refactored user settings storage, and glitch-soc has a
  different set of settings.
  References to individual settings have been removed from the file.
  Removed them as well.
- `app/views/settings/preferences/appearance/show.html.haml`:
  Upstream completely refactored user settings storage, and glitch-soc has a
  different set of settings.
  Applied upstream's changes and ported ours back.
- `app/views/settings/preferences/notifications/show.html.haml`:
  Upstream completely refactored user settings storage, and glitch-soc has a
  different set of settings.
  Applied upstream's changes and ported ours back.
- `app/views/settings/preferences/other/show.html.haml`:
  Upstream completely refactored user settings storage, and glitch-soc has a
  different set of settings.
  Applied upstream's changes and ported ours back.
- `config/settings.yml`:
  Upstream completely refactored user settings storage, and glitch-soc has a
  different set of settings.
  In particular, upstream removed user-specific and unused settings.
  Did the same in glitch-soc.
- `spec/controllers/application_controller_spec.rb`:
  Conflicts due to glitch-soc's theming system.
  Mostly kept our version, as upstream messed up the tests.

config/settings.yml

@@ -12,55 +12,17 @@ defaults: &defaults
   registrations_mode: 'open'
   profile_directory: true
   closed_registrations_message: ''
-  open_deletion: true
   timeline_preview: false
-  min_invite_role: 'admin'
   show_staff_badge: true
-  default_sensitive: false
-  unfollow_modal: false
-  boost_modal: false
-  favourite_modal: false
-  delete_modal: true
-  auto_play_gif: false
-  display_media: 'default'
-  expand_spoilers: false
   preview_sensitive_media: false
-  reduce_motion: false
-  disable_swiping: false
-  show_application: false
-  system_font_ui: false
-  system_emoji_font: false
   noindex: false
-  hide_followers_count: false
   flavour: 'glitch'
   skin: 'default'
-  aggregate_reblogs: true
-  advanced_layout: false
-  use_blurhash: true
-  use_pending_items: false
   trends: true
   trends_as_landing_page: true
   trendable_by_default: false
   trending_status_cw: true
-  crop_images: true
-  notification_emails:
-    follow: true
-    reblog: false
-    favourite: false
-    mention: true
-    follow_request: true
-    digest: true
-    report: true
-    pending_account: true
-    trending_tag: true
-    trending_link: false
-    trending_status: false
-    appeal: true
-  always_send_emails: false
-  interactions:
-    must_be_follower: false
-    must_be_following: false
-    must_be_following_dm: false
+  hide_followers_count: false
   reserved_usernames:
     - admin
     - support