web: add function to redirect Grind 75 path

Author: yangshun

apps/website/.gitignore

@@ -17,4 +17,7 @@
 
 npm-debug.log*
 yarn-debug.log*
-yarn-error.log*
+yarn-error.log*
+
+# cloudflare
+.wrangler

apps/website/functions/grind75/[[catchall]].js

@@ -0,0 +1,13 @@
+const SOURCE_HOST = 'https://grind75.vercel.app';
+
+export async function onRequest(context) {
+  const { request } = context;
+  // Define the original and target paths
+  const url = new URL(request.url);
+
+  // Rewrite to the new domain, preserving the original path and query string
+  const newURL = SOURCE_HOST + url.pathname + url.search;
+
+  // Fetch the content from the new domain
+  return await fetch(newURL, request);
+}