updated descriptor

Author: balamma

experiment-descriptor.json

@@ -13,13 +13,7 @@
       "unit-type": "task",
       "content-type": "text"
     },
-    {
-      "target": "objective.html",
-      "source": "objective.md",
-      "label": "Objective",
-      "unit-type": "task",
-      "content-type": "text"
-    },
+   
     {
       "target": "procedure.html",
       "source": "procedure.md",