[Website] Update announcement banner

Author: Andrey Cheptsov

docs/overrides/main.html

@@ -191,7 +191,7 @@
 {% endblock %}
 
 {% block announce %}
-Services now support native <a href="https://dstack.ai/blog/pd-disaggregation/" target="_blank">Prefill-Decode disaggregation</a>
+Infrastructure orchestration is becoming an <a href="/blog/agentic-orchestration/" target="_blank">agent skill</a>
 {% endblock %}
 
 {% block footer %}