front page 'Reference' link should land on basic-retriever

Author: akollegger

src/content/docs/index.mdx

@@ -34,7 +34,7 @@ import { LinkCard, CardGrid } from '@astrojs/starlight/components';
 	<LinkCard 
 		title="Reference" 
 		description="GraphRAG Pattern Catalog of graph models and GraphRAG retrievers"
-		href="/reference/graphrag/pattern-matching"
+		href="/reference/graphrag/basic-retriever"
 	/>
 </CardGrid>