[docs] [issue16331] Add a version switcher to python docs site

[Yury Selivanov]

Yury Selivanov added the comment:

> What happens if the module doesn't exist in a previous version or if it has a different name?

As I said in the first message:

"""
2) Before making a redirect, is checks that the doc page exists for the selected python version, and if not, then it simply redirects to 'http://docs.python.org/{version}'
"""

That's the most sane method I can imagine.

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