18/docs/small improvements (#40)

* Remove outdated min version from docs

* Add sphinx-llm

* Update docs/maintainers/versioning-and-releases.rst

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Better logs from Sphinx in CI

* Sphinx/CI: Less verbose, warnings are not errors

* Changelog, CI nex try

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Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>