What's the best URL for the GitHub repo?

[jaraco]

Today I learned that my projects are unavailable on tea.xyz due to their GitHub url being found in the Homepage key, leading to this error:

It used to be the case that tea supported the Homepage key, but that led to problems because that value was used very loosely, sometimes pointing to subpaths within the project like the README or folder within the repo.

Therefore, they search for Source, which seems to be the most popular place to reliably configure a GitHub URL, despite other resources indicating repository.

Let's update the label to use "Source" for better clarity and to align with tea.xyz.

[jaraco]

I've drafted a fix (simply replacing the name), but this change creates a merge conflict with every downstream repo and the jaraco.develop known-merge tool doesn't yet support it, so it's going to need more support before it can be merged.

[jaraco]

Dang. So when these placeholders are in the README, the merge routine works fine to re-substitute the placeholders. But when the conflict is in the pyproject.toml, the routine is unable to load the project metadata because the syntax of that file is broken by the conflict.

And because of the way the merge tool works, the routine is only called after the conflict is already manifest, so there's no great hook point to extract the metadata before the conflict is manifest.

[jaraco]

Okay. I've worked out the issue with the merge routine and it's now successfully resolving merges that alter lines in substitutions. It should now be possible to apply the change to the skeleton and roll it out across the projects.