[docs] custom script examples, [build] move CMS make to app via event_handlers.on_build

docs/dev/custom_script_examples/docs.dev.custom_script.calculate.md

@@ -0,0 +1,24 @@
+---
+{
+	"_label": "Calculate Incentive for Sales Team"
+}
+---
+Can be used in any Sales Transaction with **Sales Team** Table:
+
+
+	cur_frm.cscript.custom_validate = function(doc) {
+	    // calculate incentives for each person on the deal
+	    total_incentive = 0
+	    $.each(wn.model.get("Sales Team", {parent:doc.name}), function(i, d) {
+
+	        // calculate incentive
+	        var incentive_percent = 2;
+	        if(doc.grand_total > 400) incentive_percent = 4;
+
+	        // actual incentive
+	        d.incentives = flt(doc.grand_total) * incentive_percent / 100;
+	        total_incentive += flt(d.incentives)
+	    });
+
+	    doc.total_incentive = total_incentive;
+	}