GitHub Discussion is not enabled

[SteveLauC]

CONTRIBUTING.md mentions that users can open discussions for general questions, but it is currently disabled:

Open a GitHub Discussion for general questions

[tjgreen42]

Lemme check with the gang about how we want to do this (GitHub Discussion, community Slack, or Discord). Then I'll update the doc. Thanks for pointing out the discrepency.

[tjgreen42]

Okay, Github Discussions have been enabled!