explicit configuration file specification for readthedocs #12419
Description
per https://about.readthedocs.com/blog/2024/12/deprecate-config-files-without-sphinx-or-mkdocs-config/ we need a sphinx.configuration key.
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per https://about.readthedocs.com/blog/2024/12/deprecate-config-files-without-sphinx-or-mkdocs-config/ we need a sphinx.configuration key.