Move quaddtype into its own repository

[ngoldbaum]

Over in numpy/numpy-user-dtypes#227 (comment), I suggested creating a new repository for quaddtype. Currently most of the activity in this repository is dominated by quaddtype and IMO it's outgrown this repository. It's also possibly confusing or discouraging for anyone who wants to experiment with adding a new dtype.

To do this, we need to:

• create a new repository in the NumPy org. It should preserve all the history in the quaddtype folder as well as the CI configuration.
• Transfer issues and pull requests related to quaddtype to the new repository
• Update CI configuration to only test quaddtype
• Update documentation and downstream links like the conda-forge feedstock to point to the new repository.

[ngoldbaum]

I asked at today's triage meeting if it's OK to create a new repo and no one objected.

[SwayamInSync]

I think we cannot recover the releases history

[SwayamInSync]

• Build workflows are working correct
• Docs build and hosting is working
• Added the pypi release environment quaddtype_release & added new repo over pypi as trusted publisher
• Issues are transferred
• PRs listed here QuadDType Development History: PRs from numpy-user-dtypes #43

[ngoldbaum]

As a last bit of cleanup we should probably add a note to the readme in the numpy-user-dtypes/quaddtype folder that we've moved development to this repository. Maybe also disable the quaddtype CI over there?

[SwayamInSync]

Sure, will do that, you can inspect the other details and let me know if anything needs to be fixed.
Conda-forge is still needed to be updated, but that'll be independent from here

[ngoldbaum]

All done! I'll send a message to the numpy mailing list to announce the move.

[SwayamInSync]

@ngoldbaum can we close this now?

[ngoldbaum]

Yeah, I already closed the original from the other repo. This one probably didn't need to be copied over.