refactor(nft-marketplace): make Next.js app static [skip ci]

Author: alsakhaev

apps/nft-marketplace/next.config.ts

@@ -1,7 +1,8 @@
-import type { NextConfig } from "next";
+import type { NextConfig } from 'next'
 
 const nextConfig: NextConfig = {
   /* config options here */
-};
+  output: 'export',
+}
 
-export default nextConfig;
+export default nextConfig