Port to Next.js with static export for Cloudflare Pages

- Create Next.js app with TypeScript, Tailwind, and Postcss
- Extract API logic, types, and utilities to lib/
- Build React components for Race Results, Driver Standings, Points Key, and D3 Chart
- Use environment variables for API credentials (NEXT_PUBLIC_*)
- Static export (output: 'export') for Cloudflare Pages deployment
- D3 chart rendered client-side with dynamic import
- Update deploy workflow to build and deploy ./out directory
- Remove original public/index.html

.gitignore

@@ -0,0 +1,15 @@
+# Dependencies
+node_modules/
+npm-debug.log
+yarn-error.log
+
+# Next.js
+.next/
+out/
+
+# Environment
+.env.local
+.env.*.local
+
+# OS
+.DS_Store