Updates to Gemini FAQ

Hey there Geminauts!

I have just made some changes to the official Gemini FAQ at:

gemini://gemini.circumlunar.space/docs/faq.txt
gopher://gemini.circumlunar.space/0/docs/faq.txt
https://gemini.circumlunar.space/docs/faq.txt

I updated section 1.3 to mention that the mailing list archives are
accessible via Gemini, and mentioned the #gemini channel at tilde.chat.

Section 3 is entirely new and attempts to provide some advice for
newcomers to Geminispace.  In particular, please note that I am now
trying to list places where people who don't want to or can't run their
own server can find hosting.  I have added a few places I am aware of
off the top of my head, but if you provide hosting and you're not
listed but would like to be, please let me know!  If you are already
listed but you'd rather remain underground, let me know too and I'll
remove you.

Section 4 is also entirely new and provides pointers on contributing to
the community, but there is not much there yet.

Suggestions for new questions to cover in sections 3 and 4 are very
welcome!

I am considering migrating the FAQ and other essential docs to a
non-commercial git host somewhere to make it easier for other people to
take an active hand in maintaining them or proposing changes.  Feedback
on this idea is welcome too!

Cheers,
Solderpunk