docs: add ai/cookbook/rag

Author: A-Najmabadi

src/components/Sidebar/data.js

@@ -565,6 +565,10 @@ export default {
           </div>
         )
       },
+      {
+        title: "چت بات دارای RAG",
+        link: "/ai/cookbook/rag-chatbot/"
+      },
       {
         title: "چت بات چندمنظوره",
         link: "/ai/cookbook/multi-modal-chatbot"