ZEVA2 - navigation component

Implement a "first-level" navigation component that displays links to different pages of the application.

This component should be analogous to the current first-level naviagtion component in ZEVA; also, it should be present throughout the entire application, and, if, in ZEVA, the links rendered are conditional on the user's roles, then that should be the case here in ZEVA2 as well. There should be a functional logout UI as well (again, analogous to ZEVA's first-level navigation component).

This tutorial on layouts should be useful: https://nextjs.org/learn/dashboard-app/creating-layouts-and-pages

This should be helpful as well: https://nextjs.org/learn/dashboard-app/navigating-between-pages