Remove setup.py

[cdce8p]

Proposed change

With the update to pip>=21.0, it's no longer needed for editable installs.
https://pip.pypa.io/en/stable/news/#id50
Ref: home-assistant/core#59769

PR for core: home-assistant/core#66023

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (thank you!)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Example configuration

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue or discussion:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

[frenck]

Can we hold off on this one, until we have at least a nightly build passed?

[ludeeus]

This file is used by https://github.com/home-assistant/frontend/blob/dev/.github/workflows/release.yaml#L21-L22

[cdce8p]

The action has been updated and as far as I can tell, the nightly builds are successful.
@frenck This PR is be ready IMO. If you are more comfortable with waiting a bit longer, that would be fine for me too.

[frenck]

Thanks, @cdce8p 👍

Comment addressed