Kong/deck project team should add GitHub Discussions

I've noticed that many Kong projects have GitHub Discussions turned on, for example:

- Kong, https://github.com/Kong/kong/discussions
- insomnia, https://github.com/Kong/insomnia/discussions
- KIC, https://github.com/Kong/kubernetes-ingress-controller/discussions
- others

I think this GitHub feature could help pull questions out of the issue queue and provide more direct engagement on questions on the use of `deck` that some might not find in the documentation.

No repository files or tests are mentioned; start at the decK repository's GitHub Discussions setting and review how Discussions are enabled for the other Kong projects cited. Done means the repository has a Discussions area available for questions about using decK.

Written by the indexing model from the issue text.