Version dropdown not working on docs

[drozd-A]

Checklist:

• I've searched in the docs and FAQ for my answer: https://bit.ly/argocd-faq.
• I've included steps to reproduce the bug.
• I've pasted the output of argocd version.

Describe the bug

Switching ArgoCD versions often does not work on the docs site.

We have occasionally seen it work -- we cannot explain the conditions for it.

To Reproduce

1. Go to https://argo-cd.readthedocs.io/en/stable/
2. Try to switch ArgoCD versions

Expected behavior

You should be able to switch versions for ArgoCD documentation to see different versions of the docs

Screenshots

readthedocs.argocd.version.switcher.not.working.mov

Version

Paste the output from `argocd version` here.

Logs

Paste any relevant application logs here.

[Aym3nTN]

A weird finding, where it does work there is this "Error: No ad placements found" error that appears twice in the browser console; when it doesn't work that error only appears once. Maybe this observation could be helpful to debug this behavior.

[jannfis]

This is actually a dupe of #11999