The registry is a collection of lists. Such a thing probably counts as a
work under copyright, and we should pick a license.

I'm not well versed in this area, but there's some talk that source code
licenses are not well suited to non-code works. The hugely popular
Awesome lists "strongly recommend the CC0 license, but any Creative
Commons license will work" (source:
<https://github.com/sindresorhus/awesome/blob/main/pull_request_template.md>).

CC0 is a public domain equivalent license -- essentially a wordy waiver
of rights granted under copyright intended to also cover countries whose
legislation doesn't let authors voluntarily place works into the public
domain.

Should we go with CC0?