Sphinx-example-includer

- Fix a bug in the index cleaner
- Add more tests to the index cleaner

- Improve the index cleaner.
- Add debug logs to index.rst.

- Added the following options:
- Include readme into the docs index (`--readme`).
- Include the option to add a title to the documentation index.
- Clean the index docs page.

* Build Sphinx docs automatically (using `sphinx-quickstart`).
* Fetch meta data from `pyproject.toml` (e.g., name, version, authors)
* Inject the examples into the `index.rst`.
* Generate docs automatically (using `sphinx-apidoc`).
* Generate HTMLs automatically.

- Fix boken links in the pypi's readme.

The first version of the sphinx example includer. If you have a bunch of examples in a folder, it would generate rst files of those to be included in the Sphinx documentation.