reana.yaml: removals of inputs/code/outputs
Created by: dinosk
- Removes the sections from the reana.yaml files for the CWL, Yadage, Serial engines that can be removed without affecting the execution of the demo.
Connects https://github.com/reanahub/reana-client/issues/109
Signed-off-by: Dinos Kousidis dinos.kousidis@cern.ch