kde/itinerary: remove

Right now, this doesn't build anymore, it is failing with:

/home/pmos/build/src/itinerary-c47772e49de6662acd7769d5c8cef94379ea7bcf/src/app/reservationmanager.h:21:10: fatal error: KItinerary/ExtractorRepository: No such file or directory
 #include <KItinerary/ExtractorRepository>
          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

I've tried to update it to the latest ccommit, but then it fails with another error. Turns out, this package depends on kitinerary (with a k!), and whenever we update that, we also need to update this package to the latest commit. Unfortunatelly, itinerary does not have tagged versions yet.

So I would like to remove it for now, it does not seem like anybody is using it at this point, and so it's just additional maintenance effort for nothing. We could package it again, when it has tagged versions and is therefore easy to update together with kitinerary.