FEAT: OAuth now redirects to last URL signed in

UPDATE: Created the page to display lists of categories

frontend/src/pages/CategoriesPage.tsx

@@ -0,0 +1,11 @@
+import React from 'react';
+
+const CategoriesPage: React.FC = () => {
+  return (
+    <div className="categories-page">
+      <h1>Categories Page</h1>
+    </div>
+  );
+};
+
+export default CategoriesPage;