message: fix(docs-infra): re-enable SW offline mode
  This basically reverts since Firebase has fixed the issue with
  `/index.html` redirection on their side.
  PR Close
diff: {
  - "index": "/",
  + "index": "/index.html",
  "assetGroups": [
  {
  "name": "app-shell",
  "updateMode": "prefetch",
  "resources": {
  "files": [
  + "/index.html",
  "/pwa-manifest.json",
  "/app/search/search-worker.js",
  "/assets/images/favicons/favicon.ico",
  