Update documentation so api.kde.org actually picks this up

Authored by vkrause on Apr 5 2019, 2:22 PM.

Description

Update documentation so api.kde.org actually picks this up

Summary: Also, remove a few horribly outdated bits.

Subscribers: kde-pim

Tags: KDE PIM

Differential Revision: https://phabricator.kde.org/D20268