Rework release steps

[patrick-5546]

Prerequisites

• Add documentation framework #5

Things that need to be done

• Update version in pyproject.toml
• Generate CHANGELOG.md
  • Include in docs using snippets
• Tag commit
• Build and push to pip
• Publish GitHub release
  • Should match CHANGELOG.md

Reworked release steps

Step	Method
Update version in pyproject.toml	manual
Generate CHANGELOG.md, tag commit, build and push to pip	run release workflow when "Update version" is pushed to main
Publish GitHub release	Manual, copy from CHANGELOG.md

Cleanup

• Remove .github/release.yml, the previous release method
• Document release steps in docs
• Add changelog to project.urls in pyproject.toml

[patrick-5546]

New in mkdocs-material 9.0.13: define multiple aliases as the default version, e..g. stable and rolling

extra:
  version:
    default:
      - stable
      - rolling

[patrick-5546]

Could use something like https://github.com/release-drafter/release-drafter