DOC: update doc about QGIS-OTB plugin & lighter version of OTB general presentation

Yannick TANGUYrequested to merge
workshop_qgis_update into master

Small improvement of OTB & QGIS part (new screenshot, etc.)

I also made a lighter version (29 slides) of OTB general presentation : its aim is to present OTB more quickly, for short training session

Edited by Yannick TANGUY

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