feat: add catch all route and pages for 404 and 500 errors

src/app/error.tsx

@@ -0,0 +1,20 @@
+'use client';
+
+import styles from './error.module.css';
+
+export default function GlobalError({
+  error,
+  reset,
+}: {
+  error: Error;
+  reset: () => void;
+}) {
+  return (
+    <div className={styles.container}>
+      <h2>Something went wrong!</h2>
+      <a className={styles.navLink} onClick={() => reset()}>
+        Try again
+      </a>
+    </div>
+  );
+}