Delete setup.py

[jeffwidman]

This is no longer necessary: https://github.com/orgs/community/discussions/6456#discussioncomment-5244057

[sponsfreixes]

Before proceeding we need to put the package name and requirements somewhere else. I think adding the following to the setup.cfg would be enough:

[metadata]
name = htmx-flask
version = 1.0
description = A description of your package

[options]
install_requires =
    flask

[jeffwidman]

Oof, good catch, done!

PS:
pyproject.toml has superseded setup.cfg these days... pypa/setuptools#3214

But fully migrating to pyproject.toml is IMO outside the scope of this PR... let's first just get rid of setup.py. 😄