[Idea] Investigate discussion options about prime-re.github.io

[pcklink]

I think I have made the Discussions function (that I apparently already activated last December, but completely forgot about) available for everyone with a GitHub account while restricting default access to the code of the repo to read access (& fork/pull requests). Changes to the site can be restricted to a smaller team that we will need to explicitly manage. Wiki access will remain as is: no immediate write/access but access can be requested through an issue template that is linked in the first paragraph of the wiki.

This is probably the best solution for now. If people don't have a github account and don't want one they can still read the discussions, just not post. We always have the Mattermost and Neurostars options as well, but they of course also require an account.