added missing components doc page

etc/doxygen/pages/Components.dox

+/**
+\addtogroup Components Components
+Components are the main building blocks of ArmarX and offer services for other applications via Ice.
+Each component usually implements one Ice interface by which it offers its services.
+They can be configured with \ref armarx-componentproperties via config files.
+
+\defgroup ArmarXGui-Components ArmarXGui Components
+\ingroup ArmarXGui Components
+GUI related components such as the \ref RemoteGuiProvider
+
+*/