Restructure documentation (in progress)

etc/doxygen/pages/0.Overview.dox

etc/doxygen/pages/1.Installation.dox

etc/doxygen/pages/2.Tutorials.dox

etc/doxygen/pages/3.HowTos.RemoteRobot.dox

etc/doxygen/pages/3.HowTos.dox

etc/doxygen/pages/4.FAQ.dox

etc/doxygen/pages/5.Components.dox

etc/doxygen/pages/API-RobotAPI.dox

etc/doxygen/pages/RobotAPI-API-1-overview.dox

etc/doxygen/pages/RobotAPI-API-3-states.dox

etc/doxygen/pages/mainpage.dox

etc/doxygen/pages/slicedocumentation.dox