update controller not to extend apiController and make some changes in repository + serializer

src/Bundle/ChillMainBundle/Controller/DashboardApiController.php

@@ -19,17 +19,11 @@ class DashboardApiController
     {
     }
 
-    public function indexApi()
-    {
-        return $this->getDashboardConfiguration();
-    }
-
-    // I dont understand why this method is needed, but if I do a cache clear without this method present, he gives an error saying it needs to be present.
-    public function setCrudConfig()
-    {
-        return null;
-    }
-
+    /**
+     * Get user dashboard config (not yet based on user id and still hardcoded for now)
+     *
+     * @Route("/api/1.0/main/dashboard-config-item.json", methods={"get"})
+     */
     public function getDashboardConfiguration(): JsonResponse
     {
         $data = [
@@ -44,7 +38,7 @@ class DashboardApiController
             ]
         ];
 
-        return new JsonResponse($data);
+        return new JsonResponse($data, JsonResponse::HTTP_OK, []);
     }
 
 }