Remove duplicate guide in "Admin" learning track (#49588)

Author: rachaelrenk

data/learning-tracks/admin.yml

@@ -13,8 +13,6 @@ deploy_an_instance:
     - >-
       /admin/configuration/configuring-network-settings/configuring-the-hostname-for-your-instance
     - /admin/identity-and-access-management/using-saml-for-enterprise-iam
-    - >-
-      /admin/administering-your-instance/administering-your-instance-from-the-web-ui
 upgrade_your_instance:
   title: Upgrade your instance
   description: >-