[issue41028] Move docs.python.org language and version switcher out of cpython

[Ned Deily]

Ned Deily <nad at python.org> added the comment:

I went ahead and auto-backported the full PR to 3.9 and 3.8 since it applies cleanly there and did a manual backport of just the sidebar changes to 3.7 and 3.6 (added in the final merge before EOL).  Now just awaiting @ambv approval for 3.8.

For reference, compare old vs new "Docs by version" sidebar on the index pages:
https://docs.python.org/release/3.9.9/
https://docs.python.org/release/3.10.1/

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nosy: +lukasz.langa
resolution:  -> fixed
stage: patch review -> commit review
status: open -> pending
versions: +Python 3.10, Python 3.6, Python 3.7, Python 3.8, Python 3.9

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<https://bugs.python.org/issue41028>
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