-run 'make online_docs' in qt5/qtdoc
-the main page is called 'index-mockup.html'
-includes fixes from initial comments
    -"Development Tools" instead of "Application Development"

Change-Id: I50b405057794b5d1b3f41428c816c5c0780b77dc
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>