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

Conflicts:
- `app/controllers/settings/preferences_controller.rb`:
  Upstream dropping `digest` from notifications emails while we have more
  notification emails settings.
  Removed `digest` from our list while keeping our extra settings.
- `app/javascript/packs/admin.js`:
  Conflicts caused by glitch-soc's theming system.
  Applied the changes to `app/javascript/core/admin.js`.
- `app/views/settings/preferences/other/show.html.haml`:
  Upstream removed a setting close to a glitch-soc-only setting.
  Applied upstream's change.

package.json

@@ -84,7 +84,6 @@
     "object-assign": "^4.1.1",
     "object-fit-images": "^3.2.3",
     "object.values": "^1.1.5",
-    "offline-plugin": "^5.0.7",
     "path-complete-extname": "^1.0.0",
     "pg": "^8.5.0",
     "postcss": "^8.4.16",
@@ -138,6 +137,12 @@
     "webpack-cli": "^3.3.12",
     "webpack-merge": "^5.8.0",
     "wicg-inert": "^3.1.2",
+    "workbox-expiration": "^6.5.3",
+    "workbox-precaching": "^6.5.3",
+    "workbox-routing": "^6.5.3",
+    "workbox-strategies": "^6.5.3",
+    "workbox-webpack-plugin": "^6.5.3",
+    "workbox-window": "^6.5.3",
     "ws": "^8.8.1"
   },
   "devDependencies": {