T11426: Move away from LiquidThreads in the wikis

[Carl Schwan]

ognarb updated the task description.

TASK DETAIL
  https://phabricator.kde.org/T11426

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