chore: remove deprecated code

[alcarney]

Description (e.g. "Related to ...", etc.)

This PR removes the code we've previously deprecated (the old workspace and position encoding methods). All removed methods have an alternative which has been documented in the draft migration guide.

I have also started migrating some of my projects and have added them to the list of known migrations.

Code review checklist (for code reviewer to complete)

• Pull request represents a single change (i.e. not fixing disparate/unrelated things in a single PR)
• Title summarizes what is changing
• Commit messages are meaningful (see this for details)
• Tests have been included and/or updated, as appropriate
• Docstrings have been included and/or updated, as appropriate
• Standalone docs have been updated accordingly

Automated linters

You can run the lints that are run on CI locally with:

poetry install --all-extras --with dev
poetry run poe lint

[alcarney]

Thanks!

Can you think of anything else that should go into this initial pass at v2? Or shall we make a pre-release to PyPi so people can start trying it out?

[tombh]

I can't think of anything right now. We can always make more pre-releases as we need.

Would you like to have a go at making the release using the new doc in #488? I'm happy to do it too if you'd prefer.

[alcarney]

Sure, I'll give it a go! :)