Dbb-ranking-parser

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- Added support for Python 3.10, 3.11, 3.12, and 3.13.
- Dropped support for Python 3.6, 3.7, and 3.8 (which are end-of-life).
- Updated lxml to at least version 5.3.0.
- Updated library to use HTTPS URL to fetch data.
- Moved remaining project metadata from ``setup.cfg`` to
``pyproject.toml``.
- Added uv lock file (``uv.lock``) to pin versions of direct and
transitive dependencies.
- Updated Docker base image to Alpine Linux 3.21.
- Changed ``Dockerfile`` to install lxml as a Python wheel rather than
as an Alpine package.
- Introduced virtual environment to Docker container.
- Added GitHub action to build and publish Docker images.
- Switched build backend from setuptools to Hatchling.
- Moved single source of truth for version number from
``dbbrankingparser.__init__.VERSION`` to ``pyproject.toml``.
- Switched code formatter from Black to Ruff.

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- Fixed description of how to run the HTTP server in a Docker container.

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- Fixed reStructuredText issues in changelog which prevented a release
on PyPI.

----------------

- Added support for Python 3.6, 3.7, 3.8, and 3.9.
- Dropped support for Python 3.4 and 3.5 (which are end-of-life).
- Updated lxml to at least version 4.6.2.
- Moved package metadata from ``setup.py`` to ``setup.cfg``.
- Switched to a ``src/`` project layout.
- Added type hints (PEP 484).
- Ported tests from ``unittest`` to pytest.
- Merged basic and HTTP server command line interfaces into a single
argument parser with subcommands ``get`` and ``serve``. Removed
``dbb-ranking-server`` entrypoint.
- Renamed command line entrypoint to ``dbb-ranking-parser``.
- Added command line option ``--version`` to show the application's
version.
- Merged the previous three ``Dockerfile`` files into a single one.
- Updated and simplified Docker image and build process by upgrading
Alpine Linux to 3.13 and installing lxml as a binary package,
removing the need for local compilation.

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- Allowed to specify the HTTP server's host and port on the command
line.
- Fixed ``Dockerfile`` for the HTTP server to bind it to a public address
instead of localhost so that exposing the port actually works.

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- Added HTTP server that wraps the parser and responds with rankings as
JSON.
- Added ``Dockerfile`` files for the command line script and the HTTP
server.