docs(client): add a note to specify how the new client is served

website/server/controllers/top-level/pages.js

@@ -88,6 +88,9 @@ api.getFrontPage = {
 
 // All requests to /new_app (except /new_app/static) should serve the new client in development
 // if (IS_PROD && IS_NEW_CLIENT_ENABLED) {
+
+// All the routes (except for the api and payments routes) serve the new client side
+// The code that does it can be found in /middlewares/notFound.js
 api.getNewClient = {
   method: 'GET',
   url: '/',