Add Ekos docs to KStars
Summary: Ekos docs by Jasem Mutlaq (converted by his permission), screenshots and video from the StellarMate site.
Test Plan: checkXML5, meinproc5, and PDF conversion works fine.
Reviewers: Documentation, KStars, mutlaqja
Reviewed By: KStars, mutlaqja
Subscribers: kde-edu, kde-doc-english
Tags: KDE Edu, Documentation
Differential Revision: https://phabricator.kde.org/D18335