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

postcss.config.mjs

@@ -0,0 +1,9 @@
+/** @type {import('postcss-load-config').Config} */
+const config = {
+  plugins: {
+    tailwindcss: {},
+    autoprefixer: {},
+  },
+};
+
+export default config;