feat: add error and not found page, provided by nextjs example

src/app/error.tsx

@@ -0,0 +1,33 @@
+"use client";
+
+import { useEffect } from "react";
+
+const ErrorBoundary = ({
+  error,
+  reset,
+}: {
+  error: Error & { digest?: string };
+  reset: () => void;
+}) => {
+  useEffect(() => {
+    // Log the error to an error reporting service
+    console.error(error);
+  }, [error]);
+
+  return (
+    <div>
+      <h1>Something went wrong!</h1>
+      <button
+        type="button"
+        onClick={
+          // Attempt to recover by trying to re-render the segment
+          () => reset()
+        }
+      >
+        Try again
+      </button>
+    </div>
+  );
+};
+
+export default ErrorBoundary;

src/app/not-found.tsx

@@ -0,0 +1,11 @@
+import Link from "next/link";
+
+export default function NotFound() {
+  return (
+    <div>
+      <h1>Not Found</h1>
+      <p>Could not find requested resource</p>
+      <Link href="/">Return Home</Link>
+    </div>
+  );
+}