Missing system service and documentation for serial web terminal

[SchoolGuy]

The documentation describes that Orthos 2 is able to use WebSockets to proxy the serial console inside the Web UI. This would eliminate the need for a cscreen server. Sadly however the feature is poorly documented and no systemd unit is available.

Docs: https://orthos2.readthedocs.io/en/latest/adminguide/websocket.html