Update AI Dev Tools Zoomcamp announcement text in header.yaml for clarity and conciseness.

Author: kavaivaleri

_data/header.yaml

@@ -11,6 +11,6 @@ announcement:
   # text: "LLM Zoomcamp: Free LLM engineering course."
   # link_text: "Register here!"
   # link: "https://github.com/DataTalksClub/llm-zoomcamp"
-  text: "AI Dev Tools Zoomcamp 2025: Master coding assistants, agents and automation. Starts Nov 18."
+  text: "AI Dev Tools Zoomcamp: Learn AI-powered coding assistants and agents"
   link_text: "Register here!"
   link: "https://airtable.com/appJRFiWKHBgmEt70/shrpw7rk55Ewr1jCG"