Fix access control in Admin Index and hide Admin link in navbar

app/Livewire/Admin/Index.php

@@ -11,7 +11,7 @@ class Index extends Component
     public $users = [];
     public function mount()
     {
-        if (!isInstanceAdmin()) {
+        if (auth()->user()->id !== 0) {
             return redirect()->route('dashboard');
         }
         $this->users = User::whereHas('teams', function ($query) {

resources/views/components/navbar.blade.php

@@ -142,7 +142,7 @@
 
                 </ul>
             </details>
-            @if (isCloud() && isInstanceAdmin())
+            {{-- @if (isCloud() && isInstanceAdmin())
                 <li title="Admin">
                     <a class="hover:bg-transparent" href="/admin">
                         <svg class="text-pink-600 icon" viewBox="0 0 256 256" xmlns="http://www.w3.org/2000/svg">
@@ -151,7 +151,7 @@
                         </svg>
                     </a>
                 </li>
-            @endif
+            @endif --}}
             <div class="flex-1"></div>
             @if (isInstanceAdmin() && !isCloud())
                 @persist('upgrade')