Sphinx-substitution-extensions

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- Support the ``substitution-code`` role in MyST documents.
- Support the ``substitution-download`` role in MyST documents.
- Drop support for Python 3.10.

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- Supports situations where there is no source file name available to the extension, such as when using ``sphinx_toolbox.rest_example``.

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- Support Python 3.13.
- In MyST documents, support the ``myst_sub_delimiters`` option.
This means you can use the ``{{replace-me}}`` syntax in MyST documents.

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- Bump the minimum supported version of Sphinx to 7.3.5.
- Remove support for ``sphinx-prompt``.
Please create a GitHub issue if you have a use case for this extension which is not covered by the built-in Sphinx functionality.

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- Add ``substitution-download`` role.

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- Add support for MyST.
Thanks to Václav Votípka (eNcacz) for the contribution.