Resurrect the Embedded Linux page

Task-number: QTBUG-36412
Task-number: QTBUG-36580
Change-Id: Iab31f2f71e2b8f2e9ce8baa179544aaa2ab8f0a4
Reviewed-by: Jørgen Lind <jorgen.lind@digia.com>
Reviewed-by: Venugopal Shivashankar <venugopal.shivashankar@digia.com>