Remove IRC from community chat instructions

[AndrewKvalheim]

re #422

[strugee]

@AndrewKvalheim do you need anything else from anyone here before merge?

[AndrewKvalheim]

Just resolutions to the review. Looks like someone needs to either decide on a contact address or write an issue explaining that we want IRC bridging.

Personally I don’t see the need for either, am not familiar with what contact addresses we have, and have no interest in supporting IRC bridging in the first place so would be a poor advocate for it. I don’t personally care what we end up doing with this and would be happy for those who actively hold opinions on the matter to continue editing without making me a critical part of the loop.

[altsalt]

decide on a contact address

If this is the only blocker, please just use participate@ and lgtm