doc: get rid of deprecated ``include(qibuild.cmake)``

Change-Id: I60f3f259feaf7de5fdd678f3f8c1f72c4933e17a
Reviewed-on: http://gerrit.aldebaran.lan:8080/12377
Reviewed-by: dmerejkowsky <dmerejkowsky@aldebaran-robotics.com>
Tested-by: dmerejkowsky <dmerejkowsky@aldebaran-robotics.com>
allow using -j when using Ninja

Change-Id: I4043d338be57be3df09ad8c992df143ce8626c54
Reviewed-on: http://gerrit.aldebaran.lan:8080/12396
Reviewed-by: ncornu <ncornu@aldebaran-robotics.com>
Tested-by: gerrit