update model intance to nano (#156)

Author: cdgamarose-nv

docs/notebooks/1_Deep_Researcher_Web_Search.ipynb

@@ -341,7 +341,7 @@
     "\n",
     "# One LLM for all roles (orchestrator, planner, researcher)\n",
     "llm = ChatNVIDIA(\n",
-    "    model=\"nvidia/nemotron-3-super-120b-a12b\",\n",
+    "    model=\"nvidia/nemotron-3-nano-30b-a3b\",\n",
     "    base_url=\"https://integrate.api.nvidia.com/v1\",\n",
     "    temperature=1.0,\n",
     "    top_p=1.0,\n",