Doc: Added QML language reference to list of reference.

Change-Id: I34a0a47221f0562907204ea1c8db986e4a56b016
Reviewed-by: Geir Vattekar <geir.vattekar@digia.com>
Doc: removed link to "QML Demos" from QML application page.

The linked Qt Quick examples page already lists the demos.

Change-Id: I66471b2b2d2631c1b75e2f34836a0fab5762ca3d
Reviewed-by: Geir Vattekar <geir.vattekar@digia.com>
Doc: Removing "technology-apis" group.

-The new overviews are the new technology articles and that people
add arbitrary articles in the group.

Change-Id: I0227f689cc3239209c6962800525bf6391e445bd
Reviewed-by: Sze Howe Koh <szehowe.koh@gmail.com>
Reviewed-by: Geir Vattekar <geir.vattekar@digia.com>