raise docutils version bound

[alex]

fixes #1557

[alex]

Is there anything I can do to help move this forward?

[stsewd]

We may need to do some visual testing, I think we did that in the past (cc @agjohnson).

From the changelog I see some entries of interest:

• Stop setting the "footnote-reference" class value for footnote references. Use the CSS selector [role="doc-noteref"] (works since Docutils 0.18, see minimal.css for examples).
• Embed SVG images as instead of data-URI.

[alex]

Tests failing because of Sphinx 8.

[humitos]

We released a new version 3.0.0rc1 that adds support for latest docutils versions. Please, give it a try and open an issue for any problem or feedback you want to share with us.