remove ueba-tutorial.md from toc.yml file

Author: DeCohen

CloudAppSecurityDocs/toc.yml

@@ -312,8 +312,6 @@ items:
     items:
     - name: Investigate anomaly detection alerts
       href: investigate-anomaly-alerts.md
-    - name: Investigate risky users
-      href: tutorial-ueba.md
   - name: Respond to threats
     items:
     - name: Governing connected apps