Update NoPage component to display full 404 error message

Author: Vamshi-Microsoft

code/frontend/src/pages/NoPage.tsx

@@ -1,5 +1,5 @@
 const NoPage = () => {
-    return <h1>404</h1>;
+    return <h1>404 Page Not found</h1>;
 };
 
 export default NoPage;