Doc: Move all doc artifacts under one project

Although the Qt Multimedia module has two submodules, a
single project is sufficient to document these submodules,
avoiding unnecessary maintenance overhead.

Change-Id: I8fab48241b5c9aba35890a8aaa28ce7154f78c45
Reviewed-by: Topi Reiniö <topi.reinio@theqtcompany.com>

src/multimediawidgets/doc/qtmultimediawidgets.qdocconf

@@ -1,44 +0,0 @@
-include($QT_INSTALL_DOCS/global/qt-module-defaults.qdocconf)
-
-project                 = QtMultimediaWidgets
-description             = Qt Multimedia Widgets Documentation
-version                 = $QT_VERSION
-
-# The following parameters are for creating a qhp file, the qhelpgenerator
-# program can convert the qhp file into a qch file which can be opened in
-# Qt Assistant and/or Qt Creator.
-
-# Defines the name of the project. You cannot use operators (+, =, -) in
-# the name. Properties for this project are set using a qhp.<projectname>.property
-# format.
-qhp.projects = QtMultimediaWidgets
-qhp.QtMultimediaWidgets.file = qtmultimediawidgets.qhp
-qhp.QtMultimediaWidgets.namespace = org.qt-project.qtmultimediawidgets.$QT_VERSION_TAG
-qhp.QtMultimediaWidgets.indexTitle = Qt Multimedia Widgets
-qhp.QtMultimediaWidgets.virtualFolder  = qtmultimediawidgets
-
-# For listing child nodes in Qt Creator or Assistant.
-qhp.QtMultimediaWidgets.subprojects = classes
-qhp.QtMultimediaWidgets.subprojects.classes.title = C++ Classes
-qhp.QtMultimediaWidgets.subprojects.classes.indexTitle = Qt Multimedia Widgets C++ Classes
-qhp.QtMultimediaWidgets.subprojects.classes.selectors = class fake:headerfile
-qhp.QtMultimediaWidgets.subprojects.classes.sortPages = true
-
-exampledirs += ../../../examples/multimediawidgets \
-               snippets
-
-# Specify example install dir under QT_INSTALL_EXAMPLES
-examplesinstallpath = qtmultimedia/multimediawidgets
-
-headerdirs += ../
-
-imagedirs += \
-
-sourcedirs += ../
-
-excludedirs +=
-
-depends                 += qtcore qtdoc qtquick qtqml qtmultimedia qtwidgets qtgui
-
-navigation.landingpage = "Qt Multimedia Widgets"
-navigation.cppclassespage = "Qt Multimedia Widgets C++ Classes"

src/multimediawidgets/multimediawidgets.pro

@@ -7,8 +7,6 @@ qtHaveModule(opengl):!contains(QT_CONFIG, opengles1) {
    DEFINES += QT_NO_OPENGL
 }
 
-QMAKE_DOCS = $$PWD/doc/qtmultimediawidgets.qdocconf
-
 load(qt_module)
 
 PRIVATE_HEADERS += \