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Add documentation how to optimize code size in production.

app/javascript/controllers/index.js

@@ -5,4 +5,7 @@
 import { application } from "./application"
 
 import HelloController from "./hello_controller"
+import ShadcnTestController from "./shadcn_test_controller"
+
 application.register("hello", HelloController)
+application.register("shadcn-test", ShadcnTestController)