Add style for versionremoved directive

[stevepiercy]

There is no style applied for the versionremoved directive. It was added in Sphinx 7.3.

I would suggest using the same color as deprecated. A removal feels as severe, if not more than, a deprecation.

I'd be happy to submit a pull request with whatever color you think is best.

[drammock]

I would suggest using the same color as deprecated.

+1

[stevepiercy]

See also sphinx-themes/sphinx-themes.org#163 for testing the new directive.

I don't want to edit anything under the Kitchen Sink. Where should I put this snippet to test or preview until that PR gets merged?

``versionremoved``
==================

.. versionremoved:: v0.1.1

   Here's a version removed message.

   We also support *italic*, **bold**, ``code``, `links <https://www.sphinx-doc.org/>`_, and more.

[stevepiercy]

Here's a pull request preview from Plone Sphinx Theme.

https://plone-sphinx-theme--48.org.readthedocs.build/reference/special-theme-elements.html#versionremoved

PR incoming.