Communication

I have a strong feeling that we are missing a huge thing here. Communication is the key to a good community.

The existing `irc` channel, is it enough? Does it suit well? Since there's a strong opinion of `irc` being deprecated.

What are my suggestions?
- [x] Slack team (I have actually already created a team for the `jazzband`)
- [x] Integrations for different services
- [x] Add links and information to website, social accounts, emails, etc

Anything I am missing?

p.s. I think I need to set @jezdez as a slack-admin, send me a note, please.