5.0.3 - add documentation with readthedocs

What's Changed

• the codeql workflow is not providing me any value, disable it by @jepler in #134
• wwvbtk: Improve --help message & internal improvements by @jepler in #136
• Use an enum for DST status by @jepler in #137
• new python versions ahoy by @jepler in #138
• Detect additional AM timecode errors by @jepler in #140
• [pre-commit.ci] pre-commit autoupdate by @pre-commit-ci in #139
• split out mypy workflow by @jepler in #143
• remove codeql badge, we no longer use it by @jepler in #144
• Add readthedocs documentation 🎉 by @jepler in #145

Full Changelog: 5.0.2...5.0.3