Merge pull request #341 from revant/fix-node-sass-erpnext

fix(erpnext-nginx): add node-sass as production dependency

build/erpnext-nginx/install_app.sh

@@ -22,6 +22,7 @@ yarn
 yarn production --app ${APP_NAME}
 rm -fr node_modules
 yarn install --production=true
+yarn add node-sass
 
 mkdir -p /home/frappe/frappe-bench/sites/assets/${APP_NAME}
 cp -R /home/frappe/frappe-bench/apps/${APP_NAME}/${APP_NAME}/public/* /home/frappe/frappe-bench/sites/assets/${APP_NAME}