T11179: Update wikis version and theme

[Carl Schwan]

ognarb added a parent task: T10827: Website redesign.

TASK DETAIL
  https://phabricator.kde.org/T11179

To: ognarb
Cc: trickyricky26, xyquadrat, felixernst, mmustac, yurchor, kde-doc-english, ognarb, cblack, arvidhansson, konkinartem, ian, jguidon, hannahk, Ghost6, jraleigh, gennad, fbampaloukas, squeakypancakes, alexde, IohannesPetros, GB_2, mglb, crozbo, Anachronox, ndavis, firef, skadinna, aaronhoneycutt, jriddell, sheedy, lydia, ochurlaud, kvermette, mbohlender
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