[Documentation]: Activate versions of docs for each previous release

[rly]

What would you like changed or added to the documentation and why?

See https://github.com/NeurodataWithoutBorders/pynwb/pull/2011/files#r1893313673

It would be nice to allow users to access documentation from previous releases. e.g. see the numpy docs version switcher in the top-right of https://numpy.org/doc/stable/

Do you have any interest in helping write or edit the documentation?

Yes.

Code of Conduct

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• Have you checked the Contributing document?
• Have you ensured this change was not already requested?