Doc: remove images from Qt Designer and Qt Linguist example pages
Doc: remove images from Qt Designer and Qt Linguist example pages

The images were moved by mistake and cannot be found anymore. The
example index pages themselves should also be moved to qttools at
some point. The new example index pages do not usually display images.

Change-Id: Ifaaa01875484e81fa5b7f309b160e6557f5ced83
Reviewed-by: Jerome Pasion <c10995d24f6b454503389e8d00d837aef038985d@digia.com>

kobolabs/qtdoc,kobolabs/qtdoc,kobolabs/qtdoc,kobolabs/qtdoc