Configuration to restrict element-admin instance to certain homeserver

[schildbach]

Is your feature request related to a problem? Please describe.
I don't want others to use my hosted element-admin to administrate their homeserver.

Describe the solution you'd like
Skip the first screen to enter the server name. Immediately proceed to mas of the configured homeserver.

Describe alternatives you've considered
None.

[schildbach]

I just learned that you can use the SERVER_NAME env var for this. However, it doesn't skip the first screen. Rather it just pre-fills the input field.

[sandhose]

The field is made read-only though, which does restrict things to a certain homeserver?