Update taxonomy.json

taxonomy.json

@@ -103,12 +103,7 @@
    "name": "Dialogue Systems",
    "children": [
     {"name": "Open Domain Dialogue Systems"},
-    {
-     "name": "Conversational Agents",
-     "children": [
-     {"name": "Chatbots"}
-     ]
-    },
+    {"name": "Chatbots"},
     {"name": "Dialogue State Tracking (DST)"},
     {"name": "Response Generation"}
    ]
@@ -121,11 +116,8 @@
     {"name": "Multiple Choice QA (MCQA)"},
     {"name": "Community QA"},
     {"name": "Mathematical QA"},
-    {"name": "Science QA"},
     {"name": "Knowledge Base QA"},
-    {"name": "Generative QA"},
-    {"name": "Long Form QA"},
-    {"name": "Logical Reasoning QA"}
+    {"name": "Long Form QA"}
    ]
   },
   {