Checkmk Werk 13925: Drop dashboard "Checkmk server"

ID: 13925 Title: Drop dashboard "Checkmk server" Component: Multisite Level: 1 Class: New feature Version: 2.2.0i1 The "Checkmk server" dashboard is dropped. More informational overviews for Checkmk servers are available with the "Checkmk dashboard", as well as the linux specific dashboards "Linux hosts" and "Single Linux host".