DOCS: improved.
DOCS: improved.

* Fixed link to FAQ. (Because the url is in the left brackets with markdown.)
* Added links to the Bots.md documentation, because there was no way
  from the top-level README.md to get to the bots documentation.
  User-Guide.md was a natural place to have at least one link.

aaronkaplan/intelmq,certtools/intelmq,certtools/intelmq,aaronkaplan/intelmq,aaronkaplan/intelmq,certtools/intelmq