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.

Gemfile.lock

@@ -109,16 +109,16 @@ GEM
     attr_required (1.0.1)
     awrence (1.2.1)
     aws-eventstream (1.2.0)
-    aws-partitions (1.711.0)
-    aws-sdk-core (3.170.0)
+    aws-partitions (1.735.0)
+    aws-sdk-core (3.171.0)
       aws-eventstream (~> 1, >= 1.0.2)
       aws-partitions (~> 1, >= 1.651.0)
       aws-sigv4 (~> 1.5)
       jmespath (~> 1, >= 1.6.1)
-    aws-sdk-kms (1.62.0)
+    aws-sdk-kms (1.63.0)
       aws-sdk-core (~> 3, >= 3.165.0)
       aws-sigv4 (~> 1.1)
-    aws-sdk-s3 (1.119.1)
+    aws-sdk-s3 (1.119.2)
       aws-sdk-core (~> 3, >= 3.165.0)
       aws-sdk-kms (~> 1)
       aws-sigv4 (~> 1.4)
@@ -685,8 +685,8 @@ GEM
     statsd-ruby (1.5.0)
     stoplight (3.0.1)
       redlock (~> 1.0)
-    strong_migrations (0.7.9)
-      activerecord (>= 5)
+    strong_migrations (0.8.0)
+      activerecord (>= 5.2)
     swd (1.3.0)
       activesupport (>= 3)
       attr_required (>= 0.0.5)
@@ -719,7 +719,7 @@ GEM
       unf (~> 0.1.0)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
-    tzinfo-data (1.2022.7)
+    tzinfo-data (1.2023.2)
       tzinfo (>= 1.0.0)
     unf (0.1.4)
       unf_ext
@@ -885,11 +885,11 @@ DEPENDENCIES
   sprockets-rails (~> 3.4)
   stackprof
   stoplight (~> 3.0.1)
-  strong_migrations (~> 0.7)
+  strong_migrations (~> 0.8)
   thor (~> 1.2)
   tty-prompt (~> 0.23)
   twitter-text (~> 3.1.0)
-  tzinfo-data (~> 1.2022)
+  tzinfo-data (~> 1.2023)
   webauthn (~> 3.0)
   webmock (~> 3.18)
   webpacker (~> 5.4)