Markdown-checker

- Improve Dev Experience. https://github.com/john0isaac/markdown-checker/pull/28
- Better Typing. https://github.com/john0isaac/markdown-checker/pull/37
- Add ruff, black, mypy and workflows to check them on all supported python versions.
- Add pre-commit.
- Change packaging strategy to setuptools with pyproject.toml.
- Add docs in read the docs https://markdown-checker.readthedocs.io/en/latest/

* Change lessons to files
* Remove ID's from the end of Relative Paths

* Improve-package by john0isaac in https://github.com/john0isaac/markdown-checker/pull/21
* Skipped vs code redirect urls
* fixed typos

* fix: add requests to required packages by john0isaac in https://github.com/john0isaac/markdown-checker/pull/19

* add development requirements and install in devcontainer by john0isaac in https://github.com/john0isaac/markdown-checker/pull/13
* format with ruff and black by john0isaac in https://github.com/john0isaac/markdown-checker/pull/14
* improve output of checker by john0isaac in https://github.com/john0isaac/markdown-checker/pull/15
* feat: broken urls by john0isaac in https://github.com/john0isaac/markdown-checker/pull/16
* Skip microsoft security blog by john0isaac in https://github.com/john0isaac/markdown-checker/pull/17

- fix: skip video urls
- feat: add devcontainer