Feature: Remove requirements.txt and use pipenv everywhere

[stumpylog]

Proposed change

This PR removes the requirements.txt file and instead changes the Docker image and CI steps to all use pipenv.

This is mostly so dependencies are not managed in 2 places and also means dependabot will be more useful, as it no longer updates both requirements.txt and Pipfile.lock.

I compared the release zip and everything matched locations after the changes made to the release steps. These changes where required so pipenv wouldn't need create a .venv twice, for the checked code folder and again for the dist folder.

Finally, to ensure backwards compatibility with all the docs and previous releases, a requirements.txt is still generated and included as part of the release package.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Other (please explain)

Checklist:

• I have read & agree with the contributing guidelines.
• If applicable, I have tested my code for new features & regressions on both mobile & desktop devices, using the latest version of major browsers.
• If applicable, I have checked that all tests pass, see documentation.
• I have run all pre-commit hooks, see documentation.
• I have made corresponding changes to the documentation as needed.
• I have checked my modifications for any breaking changes.

[shamoon]

Yea the dependabot issue has been pretty annoying, this is great thanks as always!

[qcasey]

Thanks!

[bauerj]

Nice!

[github-actions]

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