Add Docker support and implement Bun for dependency management

- Introduced .dockerignore to exclude unnecessary files from Docker context.
- Updated Dockerfile to use Bun for building and running the application.
- Removed entrypoint.sh as it is no longer needed.
- Modified build-and-dockerise.yml to set up Bun and install dependencies.
- Enhanced index.html with improved structure and hover effects.
- Updated client.ts to include tooltips for music display.
- Implemented caching in server.ts for Last.fm data.
- Added custom styles for hover effects and tooltips in style.css.

package.json

@@ -7,7 +7,8 @@
     "start": "bun src/server.ts",
     "dev": "concurrently \"bun run --hot src/server.ts\" \"vite build --watch\"",
     "build": "vite build",
-    "preview": "vite preview"
+    "preview": "vite preview",
+    "prod": "NODE_ENV=production bun src/server.ts"
   },
   "devDependencies": {
     "@iconify/json": "^2.2.367",