added card for Building a Hybrid RAG System (#746)

Author: vannestn

examplecode/notebooks.mdx

@@ -6,6 +6,13 @@ description: "Notebooks contain complete working sample code for end-to-end solu
 ---
 
 <CardGroup cols={2}>
+    <Card title="Building a Hybrid RAG System: From Fragmented Data to Unified Intelligence" href="https://colab.research.google.com/github/Unstructured-IO/notebooks/blob/main/notebooks/Unstructured_Hybrid_RAG_Pipeline_with_ElasticSearch.ipynb">
+        <br/>
+           Learn how to build a comprehensive hybrid RAG system that processes multiple data sources simultaneously - combining S3 PDFs and Elasticsearch records into a unified knowledge base for enterprise AI applications.
+        <br/>
+           ``Unstructured API`` ``Workflows`` ``S3`` ``Elasticsearch`` ``Hybrid RAG`` ``Enterprise AI``
+        <br/>
+    </Card>
     <Card title="Dropbox-to-Pinecone Connector API Quickstart" href="https://colab.research.google.com/github/Unstructured-IO/notebooks/blob/main/notebooks/Dropbox_To_Pinecone_Connector_Quickstart.ipynb">
     <br/>
        Learn how to set up and run a custom workflow that uses a free Dropbox storage location as a source and a free Pinecone serverless index as a destination, suitable for powering RAG applications.