Offline version

Thinking of running CodeCombat as docker image on Debian GNU/Linux. The documentation says “The levels, all the data, your account and everything else lives on It is the same stuff you see there, as you will see on http://localhost:7777, except that the code in your local folder will be used instead.”. Is there a setting to switch this off, please? I would be interested in playing offline.

Was this feature available in a previous version, perhaps?