Docs: set title explicitly

[stsewd]

The current title is "{page title} - Read the Docs user documentation 9.15.0 documentation"

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📚 Documentation previews 📚

• User's documentation (docs): https://docs--10519.org.readthedocs.build/en/10519/

• Developer's documentation (dev): https://dev--10519.org.readthedocs.build/en/10519/