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

Conflicts:
- `app/controllers/concerns/sign_in_token_authentication_concern.rb`:
  Conflict due to glitch-soc's theming system.
  Ported upstream changes.
- `app/controllers/concerns/two_factor_authentication_concern.rb`:
  Conflict due to glitch-soc's theming system.
  Ported upstream changes.

package.json

@@ -154,7 +154,7 @@
     "requestidlecallback": "^0.3.0",
     "reselect": "^4.0.0",
     "rimraf": "^3.0.2",
-    "sass": "^1.26.5",
+    "sass": "^1.26.8",
     "sass-loader": "^8.0.2",
     "stacktrace-js": "^2.0.2",
     "stringz": "^2.1.0",