Add link to pubsub in cookbook

Author: viceroypenguin

src/routes/docs/[...6]cookbook/[...1]the-cookbook/+page.md

@@ -9,9 +9,13 @@ description: Ready to use examples showcasing common use cases for ImmediatePlat
 
 - [FluentValidation Integration](/docs/cookbook/fluent-validation)
 
+## Pattern examples
+
+- [Pub-Sub Pattern](/docs/cookbook/pub-sub)
+
 ## Application examples
 
 - [Web API](/docs/cookbook/web-api)
 - [Blazor Server](/docs/cookbook/blazor)
 - [Command Line Interface Application](/docs/cookbook/cli)
-- [Full-Stack Vertical Slice Architecture Application Template](/docs/cookbook/fullstack-vsa)
+- [Full-Stack Vertical Slice Architecture Application Template](/docs/cookbook/fullstack-vsa)