Documentation: theme: Fix compilation with Sphinx >= 7.0.0

Sphinx 7.0.0 has dropped support for the deprecated 'style' variable
(https://github.com/sphinx-doc/sphinx/pull/11381). This breaks
compilation of the documentation:

  /usr/bin/sphinx-build -D release=v0.1.0+16-eed6a079 -q -W -b html Documentation Documentation/html

  Theme error:
  An error happened in rendering the page api-html/index.
  Reason: UndefinedError("'style' is undefined")

The recommended replacement is 'styles[-1]'. However, this resolves to
'_static/css/theme.css', which is part of the 'css_styles' variable, and
results in the stylesheet being included twice. To avoid that and fix
the compilation error, simply drop the first reference.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

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