Hide defunct option in INSTALLATION.md
Hide defunct option in INSTALLATION.md

SysTheron/adhocracy,liqd/adhocracy,DanielNeugebauer/adhocracy,alkadis/vcv,DanielNeugebauer/adhocracy,DanielNeugebauer/adhocracy,DanielNeugebauer/adhocracy,alkadis/vcv,alkadis/vcv,liqd/adhocracy,SysTheron/adhocracy,liqd/adhocracy,SysTheron/adhocracy,alkadis/vcv,alkadis/vcv,DanielNeugebauer/adhocracy,phihag/adhocracy,phihag/adhocracy,phihag/adhocracy,phihag/adhocracy,phihag/adhocracy,liqd/adhocracy