Update ToC

Author: ntrogh

docs/toc.json

@@ -300,6 +300,7 @@
         ["AI Toolkit Overview", "/docs/intelligentapps/overview"],
         ["Models", "/docs/intelligentapps/models"],
         ["Playground", "/docs/intelligentapps/playground"],
+        ["Prompt Builder", "/docs/intelligentapps/promptbuilder"],
         ["Bulk Run", "/docs/intelligentapps/bulkrun"],
         ["Evaluation", "/docs/intelligentapps/evaluation"],
         ["Fine-tune", "/docs/intelligentapps/finetune"],