Add log out functionality

[LorenDB]

I'd like to have the ability to log out of the bot. This should be doable by saying "log out", whereupon the bot could either directly log you out or ask "Are you sure?"

[LorenDB]

Any progress being made on this?

[swissbyte]

Yes, i have implemented this feature within the pull request #122
Feel free to checkout the main branch from my fork. This also contains a lot of new features ;)