Update INSTALL.md
Update INSTALL.md

and remove references to deprecated Reference App
RanjithKumar5550/RanMifos,Vishwa1311/incubator-fineract,RanjithKumar5550/RanMifos,RanjithKumar5550/RanMifos,Vishwa1311/incubator-fineract,Vishwa1311/incubator-fineract