Which ones are the official ones? There seems to be a couple which makes it a little confusing.
* GitHub Repos:
** [[https://github.com/wikimedia/WikimediaUI-Style-Guide|@wikimedia/WikimediaUI-Style-Guide]], with GitHub Pages: https://wikimedia.github.io/WikimediaUI-Style-Guide/
* WMFLabs:
** http://wikimedia-ui.wmflabs.org/ - I know this is an old site and version of the WikimediaUI, but I believe the subdomain should be a different name. With a title like that, at first it can seem like the official one. Or maybe a message at the top where it says the guide has been moved elsewhere, with a link attached.
** http://living-style-guide.wmflabs.org/ - Is this the old version which is being replaced by the GitHub Pages site, or vice versa?
* On wiki
** https://www.mediawiki.org/wiki/Design/WikiFont - Will/should this documentation be moved from MediaWiki.org to the official guide, or is it to be kept on there?
** https://www.mediawiki.org/wiki/OOjs_UI
** https://www.mediawiki.org/wiki/Web_APIs_hub#Internal_resources_for_developers
**Summary:**
**https://wikimedia.github.io/WikimediaUI-Style-Guide/ is the current, official style guide**, we gonna resolve this task by either deleting or clearly mark outdated resources (see sub-tasks).