Integrate sphinx-sitemap for generating a sitemap in Jupyter Book.

[github-actions]

^{This message was generated by git-bob (version: 0.14.0, model: github_models:gpt-4o, log), an experimental AI-based assistant. It can make mistakes and has limitations. Check its messages carefully.}

To enhance the search engine discoverability of our Jupyter Book hosted on GitHub Pages, we integrated the sphinx-sitemap extension. In the docs/_config.yml, we added the sphinx_sitemap extension and configured it with the appropriate site_url. Additionally, we updated the requirements.txt to include the sphinx-sitemap as a new dependency, ensuring that the sitemap is generated during the build process.

• docs/_config.yml Added configuration for sphinx_sitemap extension to enable sitemap generation.
• requirements.txt Added sphinx-sitemap to the list of required packages.

closes #381

[haesleinhuepf]

There was an error when building the Jupyter book:

File "/opt/hostedtoolcache/Python/3.12.7/x64/lib/python3.12/site-packages/sphinx/config.py", line 272, in __getattr__
    raise AttributeError(__('No such config value: %s') % name)
AttributeError: No such config value: use_multitoc_numbering

git-bob comment on how to fix this

[github-actions]

^{This message was generated by git-bob (version: 0.14.0, model: github_models:gpt-4o, log), an experimental AI-based assistant. It can make mistakes and has limitations. Check its messages carefully.}

The changes made in the pull request align with the discussion regarding the integration of the sphinx-sitemap extension. The docs/_config.yml file was updated to include the sphinx_sitemap extension and the necessary configurations, while requirements.txt now lists sphinx-sitemap as a dependency.

Regarding the build error raised by @haesleinhuepf, it appears unrelated to the changes for the sphinx-sitemap integration. The error might be due to the use_multitoc_numbering being specified somewhere in the configuration. Please check your conf.py or any related configuration files for use_multitoc_numbering and ensure it's correctly defined according to Sphinx's current documentation or implemented features. If the option isn't required, you might consider removing it. If further issues persist, consulting updated references or documentation for configurations in Jupyter Book and Sphinx would be a good next step.