[Metro AI Suite] DTD: Fix doc build failure

Author: sugnanprabhu

metro-ai-suite/deterministic-threat-detection/docs/user-guide/index.md

@@ -2,6 +2,7 @@
 :::{toctree}
 :hidden:
 
+get-started
 how-to-configure-moxa-switch
 how-to-configure-ptp
 how-to-configure-vlan-on-moxa-switch