Turn our Markdown issue templates into YAML

Fix comparison with subclasses

* Allow uvx to be executed by tox
* Adjust building semver section
* Rework release procedure with uv
* Add restview to `pyproject.toml`
* Mention PEP 639 in `pyproject.toml`
* Update Changelog
* Extend `.readthedocs.yaml` with jobs

Release/3.0.3

* Raise version 3.0.3 -> 3.0.4
* Fix #457: Re-enable Trove license identifier
* Fix #456: Fix source dist file
  - Sort MANIFEST.in and add missing files
  - Add CONTRIBUTORS, .pytest.ini, .ruff.toml, and uv.lock
* Update Changelog

Fix 3.0.3

* Fix #463: Remove duplicate code Version.bump_build
* Update changelog

Raising a prerelease version always results in a newer version, and raising
an empty prerelease version has the option to raise the patch version as well

Co-authored-by: Tom Schraitle <[email protected]>

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Co-authored-by: Bas Roos <[email protected]>
Co-authored-by: Tom Schraitle <[email protected]>