Update splash page links (#74)

Signed-off-by: Jeremy Parr-Pearson <jeremy.parr-pearson@improving.com>

Author: jeremyprime

docs/src/content/docs/index.mdx

@@ -34,10 +34,10 @@ import { Card, CardGrid } from '@astrojs/starlight/components';
 
 		[Learn more →](/repositories/)
 	</Card>
-	<Card title="Observability" icon="magnifier">
-		Monitoring and observability integration
+	<Card title="Valkey Advantage" icon="magnifier">
+		What sets Spring Data Valkey apart
 
-		[Learn more →](/observability/)
+		[Learn more →](/commons/features/)
 	</Card>
 	<Card title="Migration Guide" icon="rocket">
 		Migrate from Spring Data Redis