Context

We've had a number of improvements and bugfixes over the last few months, and a few updates to the pydata theme that will break things, so we should bump our minor version.

Milestone for the release is here
We should cut a release to push out these improvements before that update is done. Here's a milestone of issues to add to it:

• https://github.com/executablebooks/sphinx-book-theme/milestone/3

The process of creating a release is here:

• https://executablebooks.org/en/latest/contributing.html#the-process-of-creating-a-release