[NextJS] Migrate page routes to app routes

[usame-algan]

What is the feature about

Next 13 introduced app routes which are meant to replace page routes and there are performance optimizations coming out for app routes: https://nextjs.org/blog/next-13-5?trk=feed_main-feed-card-text#improving-startup-and-fast-refresh-time

The list of requirements

• Follow the migration guide: https://nextjs.org/docs/app/building-your-application/upgrading/app-router-migration