T9142: Update userbase.kde.org and remove outdated information

[Carl Schwan]

ognarb claimed this task.

TASK DETAIL
  https://phabricator.kde.org/T9142

To: ognarb
Cc: afarid, neofytosk, yurchor, ognarb, #documentation, #kde_promo, xyquadrat, alexde, davidc, Anachronox, nauticalnexus, James, nalmeida, skadinna, rgomezantoli, s8321414, jriddell, tcanabrava, lydia, valorie, sebas, apol, ltoscano, repinc
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.kde.org/pipermail/kde-doc-english/attachments/20181203/90243b3e/attachment.html>