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

Conflicts:
- `.prettierignore`:
  Upstream added a line at the end, glitch-soc had extra entries at the end.
  Added upstream's new line before glitch-soc's.
- `Gemfile.lock`:
  Upstream updated dependencies while glitch-soc has an extra one (hcaptcha).
  Updated dependencies like upstream did.
- `app/controllers/api/v1/statuses_controller.rb`:
  Not a real conflict, upstream added a parameter (`allowed_mentions`) where
  glitch-soc already had an extra one (`content_type`).
  Added upstream's new parameter.
- `app/javascript/styles/fonts/roboto-mono.scss`:
  A lot of lines were changed upstream due to code style changes, and a lot
  of those lines had path changes to accomodate glitch-soc's theming system.
  Applied upstream's style changes.
- `app/javascript/styles/fonts/roboto.scss`:
  A lot of lines were changed upstream due to code style changes, and a lot
  of those lines had path changes to accomodate glitch-soc's theming system.
  Applied upstream's style changes.

package.json

@@ -13,7 +13,7 @@
     "test": "${npm_execpath} run test:lint:js && ${npm_execpath} run test:jest",
     "test:lint": "${npm_execpath} run test:lint:js && ${npm_execpath} run test:lint:sass",
     "test:lint:js": "eslint --ext=js . --cache --report-unused-disable-directives",
-    "test:lint:sass": "stylelint \"**/*.{css,scss}\"",
+    "test:lint:sass": "stylelint \"**/*.{css,scss}\" && prettier --check \"**/*.{css,scss}\"",
     "test:jest": "cross-env NODE_ENV=test jest",
     "format": "prettier --write \"**/*.{json,yml}\"",
     "format-check": "prettier --check \"**/*.{json,yml}\""
@@ -159,8 +159,8 @@
     "raf": "^3.4.1",
     "react-intl-translations-manager": "^5.0.3",
     "react-test-renderer": "^16.14.0",
-    "stylelint": "^14.16.1",
-    "stylelint-config-standard-scss": "^6.1.0",
+    "stylelint": "^15.1.0",
+    "stylelint-config-standard-scss": "^7.0.0",
     "webpack-dev-server": "^3.11.3",
     "yargs": "^17.6.2"
   },