Updating the faq

Note: As described here (https://github.com/tildeclub/tilde.club/issues/47) I'm updating the faq a bit. But this is only my second pull request ever, and I know other people are working on faq things. Hope I'm not doing this wrong or stepping on anyone's toes.

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Putting the externally facing info up on the top, started talking about netiquette, and pointed all new people to ~ anthonydpaul’s great primer. (his primer links to other docs that address complex topics, so it’s good to start everyone in the same place and branch from there)
Yeah good point, easily amended