Add CMS setup, update frontend pages and layouts, and modify json configs

next.config.mjs

@@ -1,4 +1,5 @@
+import { withPayload } from "@payloadcms/next/withPayload";
 /** @type {import('next').NextConfig} */
 const nextConfig = {};
 
-export default nextConfig;
+export default withPayload(nextConfig);