exclude ai-foundry from index page

Author: ivorb

index.md

@@ -11,5 +11,7 @@ The following exercises are designed to support the modules on Microsoft Learn.
 
 {% assign labs = site.pages | where_exp:"page", "page.url contains '/Instructions/Exercises'" %}
 {% for activity in labs  %}
+{% unless activity.url contains 'ai-foundry' %}
 - [{{ activity.lab.title }}]({{ site.github.url }}{{ activity.url }})
+{% endunless %}
 {% endfor %}