The rationale here is we don't believe YAML files contained in this
repository are actually copyrightable. They are more like math than
code, really, so let's not bother anyone with this crap.

It's also very unlikely people will reuse entire source files as is,
which makes copyright claims even less credible.

On the other hand, if we do leave copyright more open, we're possibly
more likely to have others reuse those formulas and, maybe, who knows,
contribute back.

Source: https://creativecommons.org/publicdomain/zero/1.0/legalcode.txt
Inspiration: tpo/network-health/metrics/timeline@9d7cfeeb
Closes: #10