T11179: Update wikis version and theme

[Carl Schwan]

ognarb updated the task description.

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

To: ognarb
Cc: mmustac, yurchor, kde-doc-english, ognarb, gennad, fbampaloukas, GB_2, Anachronox, skadinna, jriddell, sheedy, lydia, ochurlaud, kvermette
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