I spotted a couple of problems with the tutorials toolbar, and I've explored them a bit with Moriel and Roan.

1. The Docs link is broken. It comes from

demos/tutorials/widgets/toolbar.js

I think it can be fixed by replacing "oojs-ui/master/js" with "js/" on line 29.

2. Toolbar menu icons load locally, but not on doc.wikimedia.org. The submenu links are loaded from

dist/oojs-ui-wikimediaui-icons-content.css

and can be seen both locally and in production. We think the missing links come from

dist/oojs-ui-wikimediaui-icons-editing-citation.css

so a link to this file should be added to all 3 HTML files:

tutorials/index.html

tutorials/collection/basics1/contents.html

tutorials/collection/basics2/contents.html

However, we're not sure why the missing links do load locally, while a link to this CSS file is missing.