cubicweb-vcwiki #3767610 CSS is not present in the page preview [validation pending]

And thus links from the wiki ReST directive do not look right.

prioritynormal
typebug
done in0.2.0
load0.100
load left0.000
closed by#e7ea03627b4b Add cube css file to the stylesheets' list.
patchAdd cube css file to the stylesheets' list. [applied]