Doc: Fix QCH documentation structure for Qt Quick Layouts

Remove 'type = manual' definition from the .qdocconf to prevent links
on the module page from being added as subtopics. Also, fix the QML
Types topic to point to the correct index page.

Task-number: QTBUG-31778
Change-Id: I3df99e0fafff4bf807b952ad4bf976e2a481221d
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
Reviewed-by: Shawn Rutledge <shawn.rutledge@digia.com>