Version Checks (indicate both or one)

• I have confirmed this bug exists on the lastest release of PyPSA.

• I have confirmed this bug exists on the current master branch of PyPSA.

Issue Description

I noticed for several months now that a version selector issue persists in the pypsa documentation. See screenshot. It often appears after scrolling up and down etc.

Why does this error likely happen? Because this is a custom event/embedding on the website which listens to readthedocs. The guilty script is probably: https://github.com/PyPSA/PyPSA/blob/master/docs/assets/javascripts/readthedocs.js which is missing some sense of stopping the "version field creation process".

Reproducible Example

This can't be reproduced locally. Just on a readthedocs webhosted version.

For testing a solution, one could self-host a forked PyPSA version of the documentation on readthedocs.

Expected Behavior

A single latest version field.

Installed Versions

No response