docs: add links to ListService document

docs/en/UI/Angular/Track-By-Service.md

@@ -111,3 +111,9 @@ class DemoComponent {
   trackByTenantAccountId = trackByDeep<Item>('tenant', 'account', 'id');
 }
 ```
+
+
+
+## What's Next?
+
+- [ListService](./List-Service.md)

docs/en/docs-nav.json

@@ -383,6 +383,10 @@
             {
               "text": "TrackByService",
               "path": "UI/Angular/Track-By-Service.md"
+            },
+            {
+              "text": "ListService",
+              "path": "UI/Angular/List-Service.md"
             }
           ]
         },