[pydotorg-www] Correction for CheeseShopTutorial link

[Dennis Yu]

At the top of the page (https://wiki.python.org/moin/CheeseShopTutorial) it
has:

*A short introduction on how to install packages from the Python Package
Index (PyPI) <http://pypi.python.org/pypi>, and how to make, distribute and
upload your own.*

*This guide is no longer being maintained - more up to date and complete
information is in the Python Packaging User Guide
<https://python-packaging-user-guide.readthedocs.org/en/latest/>.*
The link to Python Packaging User Guide is
https://python-packaging-user-guide.readthedocs.io/en/latest/ but it 404's,
does not exist.

The correct link address took a little bit of digging. It is:
https://packaging.python.org/

Also I suggest putting "*This guide is no longer being maintained" *as the
first line on the page.
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