Avoid central index.cds files to ease extensibility

fiori/app/-index.cds

@@ -0,0 +1,12 @@
+/*
+  This model controls what gets served to Fiori frontends...
+*/
+
+using from './admin/fiori-service';
+using from './browse/fiori-service';
+using from './common';
+
+using from '@capire/common';
+
+// only works in case of embedded orders service
+using from '@capire/orders/app/orders/fiori-service';