Remove unused and unlinked qdocconf file from the project.

Change-Id: I2d0b60c47d92ba82e04a0d90877bda6b287f5a85
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>

src/imageformats/doc/qtimageformats-dita.qdocconf

-# Name of the project.
-project = QtImageFormats
-
-
-
-#Do not change the variables after this line unless you know what you are doing.
-
-outputdir = ditaxml
-outputformats = DITAXML
-
-exampledirs += ../examples
-# headerdirs +=
-# sourcedirs +=
-
-HTML.nobreadcrumbs = "true"
-
-examples.fileextensions = "*.cpp *.h *.js *.svg *.xml *.ui *.qml"
-examples.imageextensions = "*.png *.jp2 *.jpeg *.jpg *.gif *.mng"
-headers.fileextensions = "*.h *.ch *.h++ *.hh *.hpp *.hxx"
-sources.fileextensions = "*.cpp *.qdoc *.mm *.qml"
-