Issue with current documentation:

I uploaded 2.1 documentation. Now the version pulldown in the 2.0 documentation is showing red for 2.0. This is coming from #26125 (hi @melissawm) which un-commented the relevant css

Idea or request for content:

I don't understand

• why NumPy has that stanza? In the PR it was meant to give some color to the version dropdown, but it doesn't seem to be working.
• where the value for data-active-version-name comes from?