[issue33071] Document that PyPI no longer requires 'register'

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

I’m concerned that not only references to register command were deleted, but also useful general intro to PyPI.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33071>
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