[ENHANCEMENT] Add ability to use hostname / DNS to connect to siblings

[mcjon3z]

Running Villain as part of a docker stack on a remote server and using a local instance to connect to the remote server as a sibling to interact with shells. It would be nice to be able to connect to the remote server via DNS as opposed to IP address. This would also open up the ability to use ttyd in a separate container to access Villain via web browser and have it connect back to the primary docker container via the container name.

[t3l3machus]

I'll fix that asap, thank you.