Fix qt-project.org.html link in online and offline installers

Online and offline installers should create a link to
qt-project.org.html page

Change-Id: I9af38572ec47b492d8ffda1f2221266f5036168f
Reviewed-by: Sergio Ahumada <sergio.ahumada@digia.com>
Reviewed-by: Kai Koehne <kai.koehne@digia.com>