Doc: update path to command to create QML files

The command has been moved to the Qt category.
You can now choose between Qt Quick 1 and  Qt Quick 2.

Change-Id: Ifd75326eb54c01876e4701eba516ace30544822c
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>
Doc: hide Web View QML type

Support for the Web View was temporarily dropped as it
was buggy.

Change-Id: I73f6950b6135133cbc4cb69c952271392e00f9c2
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>
Doc: add the Reset View button icon

To make it clearer which button users need to click.

Change-Id: I8e5c38c34262fb569785f99ce64a83760a56468f
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>
Doc: use a macro for the Qt Quick Designer product name

Change-Id: I2aebd41e4e7d64d7941f41c54453a41c8c2d3408
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>
Doc: describe available positioning methods in one place

Move information about positioning from the "Using Qt Quick
Designer" topic to the "Creating Screens" topic.
Arrange the information in the same way as in the Qt Reference
Documentation. Add information about "Using Layouts" and
"Using Split Views".

Change-Id: I0f940b5f578d5f52e787ef83d230a67efb158a4d
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>