text: Title: Webapp Shows Unnecessary DS Intructions for Local Public Suffixes
  Body: This dialog should be much easier for local public suffixes. The web app has a list of such suffixes so it could easily conclude that it is unnecessary to show this:
  
  ![image](https://github.com/desec-io/desec-stack/assets/1026940/3e43194d-18b2-4eeb-83c4-3fc1b8984117)
  
  @Rotzbua would you be interested in looking into this?