Use poetry for package management.

[valberg]

This should be merged before #178

A lot of credit goes to @MrCordeiro and his changes in https://github.com/MrCordeiro/django-invitations

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@@            Coverage Diff            @@
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[jezdez]

@valberg @MrCordeiro FWIW I haven't tested the Jazzband index with Poetry, so this may or may not fail.

[jezdez]

In fact, this won't actually upload the file, @valberg! It just configures it.

[MrCordeiro]

@valberg, we're missing a publish step:

    - name: Upload packages to Jazzband
        if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags')
        uses: pypa/gh-action-pypi-publish@master
        with:
          user: jazzband
          password: ${{ secrets.JAZZBAND_RELEASE_KEY }}
          repository_url: https://jazzband.co/projects/wagtailmenus/upload 

(I'm curious to see if building it with poetry will work. Perhaps using poetry publish instead could work too?)

[jezdez]

#195 fixed this FWIW