Update index.json

add livestream to track

Author: kfahn22

content/tracks/side-tracks/livestreams/index.json

@@ -2,6 +2,7 @@
   "title": "Coding Train Live!",
   "description": "This side track is a collection of select livestreams.",
   "videos": [
+    "livestreams/creative_coding_ai_agent",
     "livestreams/shiffbot",
     "livestreams/decade-of-code",
     "livestreams/sentence-embeddings/clustering-sentence-embeddings",