Please fix current version documentation sidebar for jinja2

[Peter Moore]

Issue number #1768 is showing complete, but it looks like the issue is still ongoing even in latest https://jinja.palletsprojects.com/en/latest/api/

I believe (not sure) that I saw latest at one time got fixed but it must have reverted since. However, I never saw v3.1 fixed. The fix should be applied to all versions if possible as they are important ongoing development.

[David Lord]

Duplicate of way more of these, some of which do link to pallets/pallets-sphinx-themes#64