DOC: Fix version switcher

[datapythonista]

• closes DOC: Doc version slider is broken (no options) #53180

[mroeschke]

This is the same error I was getting in my earlier branch

2023-05-11T18:16:18.6054339Z WARNING: The version switcher "https://pandas.pydata.org/versions.json" file cannot be read due to the following error:
2023-05-11T18:16:18.6055458Z HTTPError('404 Client Error: Not Found for url: https://pandas.pydata.org/versions.json')

[datapythonista]

I think the error is because the CI docs build is looking for the production versions file, which it doesn't exist right now, but it'll exist after merging. So I'm going to merge this, and I think the next docs build should work.

[datapythonista]

Ok, it's a bit trickier, if I merge the next build will also fail before creating the file. I created the file manually in production and I'm rerunning. If it works, I'll merge, and when the docs build syncs with prod, it'll start rewriting the file.

If something is merge before this, it'll delete the file again, but I'll just recreate it until this works.

[mroeschke]

Thanks for investigating @datapythonista . Feel free to merge when ready

[datapythonista]

CI is green, and the file is still there, I think everything should be fine once the CI of the merge completes.

[datapythonista]

/preview

[github-actions]

Website preview of this PR available at: https://pandas.pydata.org/preview/53188/