fix(docs): catch-all routing (CopilotKit#515)

Author: arielweinberger

docs/next.config.mjs

@@ -15,5 +15,12 @@ export default withNextra({
         permanent: true,
       }
     ]
-  }
+  },
+  // This is needed for catch-all redirect of non existent rountes to the home page.
+  // https://github.com/vercel/next.js/discussions/16749#discussioncomment-2992732
+  async rewrites() {
+    return {
+      afterFiles: [{ source: "/:path*", destination: "/_404/:path*" }],
+    };
+  },
 });

docs/pages/[...rest].tsx

@@ -0,0 +1,9 @@
+// This is needed for catch-all redirect of non existent rountes to the home page.
+// https://github.com/vercel/next.js/discussions/16749#discussioncomment-2992732
+export const Custom404 = () => <div></div>;
+
+export const getServerSideProps = () => {
+  return { redirect: { destination: "/", permanent: false } }; 
+};
+
+export default Custom404;