Display 404 not found page when requested page does not exist

[ntimo]

Currently when opening some kind of a page that does not exist for example /metrics the netmaker ui returns a status code 200 displays and displays no error page.

This should be changed and the netmaker ui should return a proper 404 status and display some kind of not found page.

[ntimo]

Okay never mind the ui displays a not found message but it’s hidden by the menu. But still the http status should be 404 instead of 200.