feat: add 404 page (#426)

* feat: add 404 page

* chore: lint and format

* fix: remove extra line

src/pages/404/index.tsx

@@ -0,0 +1,8 @@
+import 'uno.css';
+
+import React from 'react';
+import { createRoot } from 'react-dom/client';
+
+import Page404 from './Page404';
+
+createRoot(document.getElementById('root')!).render(<Page404 />);