feat: finish basic functions

app/500.tsx

@@ -0,0 +1,12 @@
+import Link from "next/link";
+
+export default function FourOhFour() {
+  return (
+    <>
+      <h1>500 - Page Not Found</h1>
+      <Link href="/">
+        <a>Go back home</a>
+      </Link>
+    </>
+  );
+}