Refactor service worker and remove test page

- Updated service worker (sw.js) to improve caching strategies and update asset revisions.
- Deleted the test page (page.tsx) as it is no longer needed.
- Refactored EpisodeSelector component to simplify logic and improve performance.
- Added a .dockerignore file to exclude unnecessary files from Docker builds.

.dockerignore

@@ -0,0 +1,16 @@
+node_modules
+npm-debug.log
+Dockerfile
+.dockerignore
+.git
+.gitignore
+README.md
+.env
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+.next
+.vercel
+.vscode
+**/*.backup.tsx