Doc: Remove unused /parts directory from QML getting started example

The example code for getting started with QML doc has six smaller
projects under /parts - these out of sync with the main example
code in its parent directory, they are undocumented and not referred
to in any other documentation. The QML getting started guide itself
uses \code blocks to present the code snippets.

Change-Id: I3b9c83a60fdeb9fa13f364b04c38943222c682cb
Reviewed-by: Alan Alpert <aalpert@blackberry.com>
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>