docs: move to html_css_files
as add_stylesheet
is deprecated/removed
#581
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With Sphinx 4 the function
add_stylesheet()
was temporarily removedand added back in in newer versions of Sphinx. As alternative the
html_css_files
variable is mentioned, which is available sinceSphinx 1.8.
The
python3-sphinx
package with version4.3.2-1
from Ubuntu 22.04jammy doesn't have the
add_stylesheet()
API, which breaksdocumentation generation on said platform.
sphinx-doc/sphinx#9683 (comment)