Navbar on our docs landing page is essential for navigation however once a user has navigated to another page, the same information is also duplicated in a side bar.
Probably navbar should be removed whenever a sidebar present.
On the other hand, to have navbar on landing page and not have it rest of the documentation leads an inconsistency and may hurt UX.

This information is also duplicated in nav.js and themeConfig/config.mjs which means any change would need to be duplicated. This should perhaps be easier to sort out.