Remove duplicated doc files and images

- Remove doc/ files which were duplicated under src/quick/doc and
  src/qml/doc
- Remove duplicated images under src/doc/qml/images which were already
  under src/doc/quick/images
- Merged 01024133 and
  3b04bbde

 which made it into doc/src
  but not src/qml/doc

Change-Id: I275b7d29f9fc2222dcf801c257c1f67b5880446b
Reviewed-by: Alan Alpert <alan.alpert@nokia.com>