T9142: Update userbase.kde.org and remove outdated information

[Carl Schwan]

ognarb added a comment.


  @afarid Thanks, I just saw that kdenlive also has a rich tutorial. I see that you are a Kdenlive dev, could you quickly look if the information is up-to-date. I can add new screenshot later.

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
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