update on publishing through pypi

[f-hafner]

• I followed the CONTRIBUTING guidelines.

I propose a fix to #290:

• recommend Github actions as default for distributing packages through pypi; update links to documentation
• suggest workflow with testpypi and manual uploads with 2FA for debugging, based on the discussion in said issue

Notes

• I have not tried out the "new" manual way with 2FA
• I removed the link to the twine tutorial as it's outdated

Questions

• signing distribution packages is not described, but it's here -- should I add something about it?
• should the release workflow in the python template (the generated README.dev.md) be synced with the changes made here?

[bouweandela]

Thanks for the update! ✨ I would suggest reducing the amount of text a bit because that will make it easier to maintain: maybe remove the links to examples and the extensive explanation of how to use test pypi (link to an external resource describing this workflow instead)?

Updating the python-template so it follows what is described in the guide would be nice.

[f-hafner]

I shortened as suggested, what do you think?

To update the template, I will make an issue.

[bouweandela]

Thanks!