style: remove redundant Navigation box and label

Author: drewswiredin

src/layouts/TuiLayout.astro

@@ -93,8 +93,8 @@ const topReference = sortByOrder(referenceRaw.filter(e => !e.id.includes('/')),
     </header>
     <div class="flex flex-1 gap-2 overflow-hidden">
       <!-- Navigation Panel -->
-      <aside class="relative border border-tui-border-inactive w-80 flex flex-col mt-2">
-        <span class="absolute -top-2.5 left-2 bg-tui-bg px-1 text-[11px] font-bold text-tui-accent tracking-tighter">Navigation</span>
+      <aside class="w-80 flex flex-col mt-2">
+        
 
         <nav class="flex-1 overflow-y-auto p-2 pt-4 flex flex-col gap-4 scrollbar-hide text-xs">