Serve the home nav link from PocketBase, not a hard-coded copy

Elternbeirat.Web/Components/Layout/MainLayout.razor.css

@@ -60,12 +60,10 @@
     gap: 0.25rem 1.25rem;
 }
 
-/* The hamburger button, its state checkbox, and the mobile-only home link are
-   hidden on wide screens; the media query below turns them on for narrow ones.
-   (On wide screens the brand is the home link, so a "Start" entry is redundant.) */
+/* The hamburger button and its state checkbox are hidden on wide screens; the
+   media query below turns them on for narrow ones. */
 .nav-toggle,
-.nav-toggle-label,
-.nav-home-mobile {
+.nav-toggle-label {
     display: none;
 }
 
@@ -177,11 +175,6 @@
         margin-top: 0.5rem;
     }
 
-    /* The mobile-only home link reappears as the first entry in the menu. */
-    .nav-home-mobile {
-        display: block;
-    }
-
     /* Mobile per-link spacing/separators for .main-nav a are in the global app.css
        too, for the same scoped-attribute reason as above. */
 }