Add TeachBooks-Questions to the book TOC and TeachBooks Favourites list, and include Sphinx Gated Directives and TeachBooks Zoomies in the favourites page. Also tidy requirements.txt by removing an inline bump comment from the TeachBooks-Favourites git dependency. Changes touch book/_toc.yml, book/features/favourites.md, and requirements.txt to surface the new/manual links and clean up metadata.
Switched teachbooks dependency to use a specific Git branch (issue-127) instead of the released version. This allows for testing or using unreleased changes from the repository.
Cleaned up book/_config.yml by removing unused or unnecessary Sphinx configuration options related to sphinx_gated_directives and sphinx_codex. This helps simplify the configuration file.
The sphinx_tudelft_theme extension has been removed from the list of Sphinx extensions in the configuration file, possibly because it is no longer needed or has been replaced.
Deleted the custom 'include_remove_yaml' Sphinx extension and its configuration. Cleaned up YAML front matter from intro.md. Updated requirements.txt to use released teachbooks package, added sphinx-gated-directives, and removed duplicate or outdated dependencies.
Introduced a custom Sphinx extension 'include_remove_yaml' to strip YAML front matter from included files. Updated _config.yml to register the extension, and added YAML front matter to intro.md for demonstration.
Deleted instructie.ipynb, instructie_2.ipynb, and lesoefeningen.ipynb from the book. Updated _toc.yml to remove references to these files and moved the Sphinx-Gated-Directives manual link to the correct section. Minor update to intro.md.
Added an external manual link to the table of contents. Updated requirements to use TeachBooks from the 'issue-127' branch and adjusted comments for clarity.
Removed the local sphinx_gated_directives extension and updated configuration to use the external package. Added Sphinx-Gated-Directives as a dependency in requirements.txt and adjusted _config.yml to load it as an extra extension.
Deleted the code-align.css file that enforced left alignment for docutils code cells. Updated the requirements.txt comment for TeachBooks-Favourites to reference 'patches' instead of 'codex'.
