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.

.dockerignore

@@ -0,0 +1,47 @@
+# Dependencies
+node_modules/
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Development files
+src/
+index.html
+vite.config.js
+*.md
+.git/
+.gitignore
+
+# OS generated files
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db
+
+# Editor files
+.vscode/
+.idea/
+*.swp
+*.swo
+
+# Logs
+logs
+*.log
+
+# Environment files
+.env
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+# CI/CD
+.forgejo/
+.github/
+
+# Other
+coverage/
+.nyc_output/