Add link to blog for SwaggerUI sample

Author: maartenba

src/content/docs/bff/samples/index.mdx

@@ -96,6 +96,7 @@ This sample shows how to use the BFF extensions for Microsoft YARP.
 ## OpenAPI and SwaggerUI
 
 This sample shows how to use OpenAPI and SwaggerUI in combination with BFF.
+A walkthrough is available [on the Duende blog](https://blog.duendesoftware.com/posts/20250430-managing-openapi-specifications-with-backend-for-frontend-and-swagger-ui).
 
 <LinkCard
   description="GitHub Repository for the BFF framework integration with OpenAPI and SwaggerUI"