DOC: Pointers to other reading and getting help in Intro
DOC: Pointers to other reading and getting help in Intro

This is redundant with content on the main landing page of
http://tulip-control.org (doc/website/index.html in the repository)
However, it seems appropriate for the Introduction page in the
User's Guide.

necozay/tulip-control,tulip-control/tulip-control,tulip-control/tulip-control,necozay/tulip-control,tulip-control/tulip-control,necozay/tulip-control,tulip-control/tulip-control,necozay/tulip-control,necozay/tulip-control