CIEDE2000 color difference about d3-color

[Fil]

Here's Mike's notebook refactored as a function:
https://observablehq.com/d/32f6092ebe8847bf

(And………… I had missed this issue :^) I've now unpublished my notebook and link to this repo instead)

And this test notebook:
https://observablehq.com/@fil/perceptually-uniform

[danburzo]

I think this issue can be closed now that d3-color-difference is mentioned in the README.

[Fil]

It's an interesting function but I don't mind having it in a separate module. Maybe it could be easier to discover with a link in this module’s README, and a more demo notebooks? There are already quite a few links in the "For additional color spaces, see:" paragraph, which could have a title ("Extensions") and add this module?

[danburzo]

It's an interesting function but I don't mind having it in a separate module.

Yep, a separate module works for me.