[VAD] disable secretariat option in motif config when VAD
Created by: adipasquale
VAD motifs cannot be performed by the secretariat
when VAD is checked:
- force uncheck secretaraiat
- disable the secretariat checkbox
- make secretariat block grayed out (translucent) so it's clear it's not compatible.
I try to write mostly vanilla JS and as little jQuery as possible, let me know if you don't like it