in-bot documentation

The bot currently has two options providing some additional documentation about the project.

One of them shows links to alternative software mirrors. The other one explains what Tor is, in a general kind of sense. Considering that this bot is meant for those that really need it, it may be a good idea to find out how we can relay as much useful information to those people as possible. Bridges? How to stay safe? Additional instructions revolving around deleting the conversations? Allowing people to browse the entire documentation available on the web?