Adding project links to PyPI#

I spotted a neat looking project links section on https://pypi.org/project/ExifReader/

Turns out that’s added using a project_urls key in setup.py, e.g. here: https://gitlab.com/Cyb3r-Jak3/exifreader/-/blob/publish/setup.py

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    project_urls={
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        "Issues": "https://gitlab.com/Cyb3r-Jak3/ExifReader/issues",
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        "Source Code": "https://gitlab.com/Cyb3r-Jak3/ExifReader/-/tree/publish",
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        "CI": "https://gitlab.com/Cyb3r-Jak3/ExifReader/pipelines",
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        "Releases": "https://github.com/Cyb3r-Jak3/ExifReader"
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    },

The documentation says that the keys can be any string you like. So where do those icons come from?

I looked at the HTML source code and searched the PyPI website source code for one of the CSS classes I found there: https://github.com/pypa/warehouse/search?q=fa-bug&unscoped_q=fa-bug

This lead me to the macro that defines the custom icons, which shows what custom keys or URLs are supported: https://github.com/pypa/warehouse/blob/2f00f4a9f208546ff0ebb6a6e61439021ca60a43/warehouse/templates/packaging/detail.html#L16-L60

I added these to the sqlite-utils PyPI page in this commit.