Update sphinx-collapse-admonitions to point to here

[rkdarst]

https://github.com/choldgraf/sphinx-collapse-admonitions could be updated (the "about" on the side for example, better yet the readme) to point to here. I found that, noticed it was archived, didn't use it, and spent several days searching for something else that was active. Only today I realized I should check sphinx-book-theme's dependencies for clues, and found this which is exactly what I wanted.

(perhaps related, throw in the word "collapse" to these docs somewhere, so that it's more findable? I couldn't think of the right term to find this project...)

Thanks for making this!

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[choldgraf]

Hmmm good point about the other repo - I actually just decided to delete it.

re: this package, I agree that adding "collapse" in here would be helpful