New myst-parser release

[Chris Sewell]

Hi all 👋,

I'm pleased to announce a new release of myst-parser (and myst-docutils),
that brings a number of exciting new features, improvements, and upgrades 🎉
https://myst-parser.readthedocs.io

- 📚 Rewritten documentation, with a clearer structure, many more examples, rich hover tips, and a new live preview page (powered by pyscript)
  - The code base API is also now fully documented by https://sphinx-autodoc2.readthedocs.io/, which even allows for MyST docstrings!
- ⬆️ Add Sphinx 6 support
- 📄 Extended docutils (single-page) support
- 🔗 Extended Markdown links, including intersphinx support, e.g. `[text](inv:name#target)`
- `{}` New attributes syntax, to extend common Markdown syntaxes, e.g. `{#id .class width=100px}`

For a full list of changes, see: https://github.com/executablebooks/MyST-Parser/blob/master/CHANGELOG.md

Happy parsing! 🤖
Executable books team