ENH - Move to hatch for dev/build

[trallard]

This PR adds the following changes:

• Changes to hatch for our build and dev
• Adds GitHub workflows for building and publishing releases
• Update documentation to reflect these changes
• Add contrast tests (will be configured in a separate PR)
• Use pathlib for path handling

TODO:

• [x] Add secrets needed by the workflows

[trallard]

I think this is ready for a review - there might be some bits I missed but can do another check tomorrow

[github-actions[bot]]

PR Preview Action v1.2.0 :---: :rocket: Deployed preview to https://Quansight-Labs.github.io/accessible-pygments/pr-preview/pr-27/ on branch gh-pages at 2023-04-05 09:36 UTC