Add architecture diagram to agentic rag NIM notebook

notebooks/agentic_rag_with_nemo_retriever_nims.ipynb

@@ -78,7 +78,7 @@
     "\n",
     "To implement this, an application developer must include the finer-level decision-making on top of their RAG pipeline. Figure below shows one of the many renditions on a router node depending on the use case. Here, the router takes a decision to rewrite the query with help on an LLM, perchance of better recall from the retrieve.\n",
     "\n",
-    "![alt text](agentic_rag.png \"Title\")\n",
+    "![alt text](./imgs/agentic_rag.png \"Title\")\n",
     "\n",
     "**Query decomposer**: Breaks down the question into multiple smaller logical questions, and is helpful when a question needs to be answered using chunks from multiple documents.\n",
     "\n",