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)