Update Choqok website to use new theme and update content
WIP: need screenshots (I don't have a twitter account so somebody else need to do it), some information are looking very outdated.
Screenshots need to be uploaded to https://phabricator.kde.org/source/websites-product-screenshots/ ;)
Reviewed By: KDE Promo, jriddell
Subscribers: ltoscano, jriddell
Differential Revision: https://phabricator.kde.org/D22187