create-app: remove redundant extension config

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

packages/create-app/templates/next-app/app-config.yaml.hbs

@@ -6,12 +6,6 @@ app:
   packages: all
 
   extensions:
-    # Disable the nav items that we're manually rendering in packages/app/src/modules/nav/Sidebar.tsx
-    - nav-item:search: false
-    - nav-item:user-settings: false
-    - nav-item:catalog: false
-    - nav-item:scaffolder: false
-
     # Configure the catalog index page to be the root page, this is normally mounted on /catalog
     - page:catalog:
         config: