QmlLive screenshots should illustrate context and real-world use cases

Currently, the screenshots we use in QmlLive's documentation do not overlap with the context. The CD-cover style is not really telling the story that the developer/user should know. Consider using Neptune 3 UI's screens or something else that is more helpful so that a developer who reads Neptune 3 UI documentation will be able to connect in his/her mind that QmlLive is part of the same product suite and can be used for UI development.