Check for permissions to access settings menu and added settings menu to sidebar menu

src/Controller/SettingsController.php

@@ -40,6 +40,8 @@ class SettingsController extends AbstractController
     #[Route("/settings", name: "system_settings")]
     public function systemSettings(Request $request, TagAwareCacheInterface $cache): Response
     {
+        $this->denyAccessUnlessGranted('@config.change_system_settings');
+
         //Create a clone of the settings object
         $settings = $this->settingsManager->createTemporaryCopy(AppSettings::class);
 
@@ -62,9 +64,6 @@ class SettingsController extends AbstractController
             $cache->invalidateTags(['tree_treeview', 'sidebar_tree_update']);
         }
 
-
-
-
         //Render the form
         return $this->render('settings/settings.html.twig', [
             'form' => $form