Relegated old secure score item to reference

Author: memildin

articles/security-center/TOC.yml

@@ -40,9 +40,7 @@
 
 - name: Concepts
   items:
-  - name: Secure Score in Security Center
-    href: security-center-secure-score.md
-  - name: The enhanced Secure Score
+  - name: Secure Score
     href: secure-score-security-controls.md
   - name: Permissions
     href: security-center-permissions.md
@@ -207,6 +205,8 @@
     href: security-center-features-retirement-july2019.md
   - name: Endpoint protection assessment and recommendations 
     href: security-center-endpoint-protection.md
+  - name: Secure score (legacy)
+    href: security-center-secure-score.md
 
 - name: Resources
   items: