Please move trn discussion to github

Hi All,

I'm still working towards an official release of trn 5.0 at the end of
2025.  I think it's more appropriate to have any discussions of trn
going forward on the discussions page for my trn repository.

<https://github.com/LegalizeAdulthood/trn/discussions>

I've created a 5.0 milestone to track what's going into that release.
I believe all the UTF-8 enhancements created by @acli have been
integrated into this release.

Thanks,

-- Richard

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