jupyterhub_config.py should include inline comment its not loaded in production - only for testing

[consideRatio]

Is it correct that a 2i2c deployed jupyterhub won't load the jupyterhub_config.py file in this repo, and that its only around in order to help users test how things look locally as mentioned in the README?

I think so, but I'm not sure. If that is the case, we should make sure to inline comments about that in the jupyterhub_config.py, and clarify that such config needs to be passed via the 2i2c chart config directly.