Standardize Home vs Navigation Hub routes and labels across views

[Copilot]

The UI mixed “Home” and “Navigation Hub” semantics by routing some “Go Back Home” actions to /navbar instead of the actual landing page (/). This updates labels and link targets so “Home” consistently maps to /, while /navbar is explicitly presented as the Projects Navigation Hub.

• 404 page: fix incorrect home redirections

  • Changed “Go Back Home” action to route to /.
  • Changed “Back to Home” button to route to /.
  • Repurposed the secondary card to explicitly point to the navigation hub (/navbar) with hub-specific copy.

• Footer: clarify hub naming

  • Renamed Nav Hub link text to Projects Navigation Hub (still routes to /navbar).

• Landing page: align hub label

  • Renamed the /navbar entry from Navigation Page to Projects Navigation Hub.

<!-- 404 home action: before -> after -->
<a href="/navbar" class="btn">Home Page</a>
<a href="/" class="btn">Home Page</a>

<!-- Footer label -->
<li><a href="/navbar">Projects Navigation Hub</a></li>