feat: add vercel analytics

pages/_app.js

@@ -1,7 +1,11 @@
 import '../styles/globals.css'
+import { Analytics } from '@vercel/analytics/react';
 
 function MyApp({ Component, pageProps }) {
-  return <Component {...pageProps} />
+  return (<>
+    <Component {...pageProps} />
+    <Analytics />
+  </>)
 }
 
 export default MyApp