✨(frontend) add offline mode support

Add a offline mode support from a service worker.
The service worker will cache the assets and the
visited pages to be able to work offline.
Created a fallback page for when the user is offline
and tries to access a page that is not cached.

src/frontend/apps/impress/.eslintrc.js

@@ -10,5 +10,5 @@ module.exports = {
       rootDir: __dirname,
     },
   },
-  ignorePatterns: ['node_modules', '.eslintrc.js'],
+  ignorePatterns: ['node_modules', '.eslintrc.js', 'service-worker.js'],
 };