initial commit

app/not-found.tsx

@@ -0,0 +1,12 @@
+import Link from "next/link";
+
+export default function NotFound() {
+  return (
+    <main>
+      <h1>Not found</h1>
+      <p className="muted">
+        That post doesn&apos;t exist (it may have been renamed or deleted). <Link href="/">Back to posts</Link>
+      </p>
+    </main>
+  );
+}