Steps to replicate the issue (include links if applicable):
create the sphinx documentation
docs>make html
What happens?:
20:38:53 preparing documents... done 20:38:54 WARNING: [Social card] image cannot be an SVG image, skipping... 20:38:55 findfont: Font family ['Roboto'] not found. Falling back to DejaVu Sans. 20:38:55 findfont: Font family ['Roboto'] not found. Falling back to DejaVu Sans. 20:38:55 findfont: Font family ['Roboto'] not found. Falling back to DejaVu Sans. 20:39:24 WARNING: [Social card] image cannot be an SVG image, skipping... 20:39:24 WARNING: [Social card] image cannot be an SVG image, skipping... 20:39:24 WARNING: [Social card] image cannot be an SVG image, skipping... 20:39:24 WARNING: [Social card] image cannot be an SVG image, skipping... 20:39:24 WARNING: [Social card] image cannot be an SVG image, skipping...
https://integration.wikimedia.org/ci/job/pywikibot-core-tox-publish/5360/console