docs: revise next.js starter docs (#10520)

* docs: revised next.js starter

* update next.js starter in main docs

www/apps/book/utils/redirects.mjs

@@ -103,6 +103,11 @@ const redirects = async () => {
       destination: "/learn/fundamentals/:path*",
       permanent: true,
     },
+    {
+      source: "/learn/storefront-development/nextjs-starter",
+      destination: "/resources/nextjs-starter",
+      permanent: true,
+    },
   ]
 }