Adding MLK notebook to notebooks gallery (#702)

Author: Paul-Cornell

examplecode/notebooks.mdx

@@ -6,6 +6,12 @@ description: "Notebooks contain complete working sample code for end-to-end solu
 ---
 
 <CardGroup cols={2}>
+    <Card title="Historical research about MLK with the Unstructured API" href="https://colab.research.google.com/github/Unstructured-IO/unstructured-mlk-archive-public/blob/main/MLK_Archive_RAG_Application.ipynb">
+    <br/>This notebook explores how you can use Unstructured to gather and process declassified historical records surrounding the assassination of Dr. Martin Luther King, Jr. These processed documents can then be analyzed by using Elasticsearch and RAG.
+    <br/>
+       ``Unstructured API`` ``Workflows`` ``S3`` ``VLM`` ``NER`` ``Elasticsearch`` ``MLK`` ``National Archives``
+    <br/>
+    </Card>
     <Card title="Create a S3 to Qdrant Pipeline using the Unstructured API" href="https://colab.research.google.com/github/Unstructured-IO/notebooks/blob/main/notebooks/S3_to_Qdrant_Workflow_using_Unstructured_API.ipynb">
     <br/>
        This notebook walks through using the Unstructured Workflow Endpoint to set up a complete pipeline that pulls documents from S3, processes them using Unstructured, and stores the resulting embeddings in Qdrant for fast vector search and retrieval.