New Introduction Message

[StrangeWill]

• [ ] Confirm the message even works
• [ ] Add suggested channels (#truebeginners, #advocacy, #newsletter)
• [ ] Add suggested contact methods (call out staff/link to us on Devanooga, the contact page, etc.)
• [ ] Link to Code of Conduct

[agarzola]

For reference, here’s where we configure that message: https://github.com/devanooga/devanoobot/blob/master/config/welcome_message.js#L9-L16