Update _index.md

In draft for editorial review

Author: pareenaverma

content/learning-paths/servers-and-cloud-computing/copilot-extension/_index.md

@@ -1,6 +1,10 @@
 ---
 title: Create a RAG-based GitHub Copilot Extension in Python
 
+draft: true
+cascade:
+    draft: true
+
 minutes_to_complete: 30
 
 who_is_this_for: This is an advanced topic for software developers who want to learn how to build a Retrieval Augmented Generation (RAG) based GitHub Copilot Extension.