Update docs-nav.json

docs/en/docs-nav.json

@@ -47,6 +47,26 @@
             {
               "text": "5: Authorization",
               "path": "Tutorials/Part-5.md"
+            },
+            {
+              "text": "6: Authors: Domain layer",
+              "path": "Tutorials/Part-6.md"
+            },
+            {
+              "text": "7: Authors: Database Integration",
+              "path": "Tutorials/Part-7.md"
+            },
+            {
+              "text": "8: Authors: Application Layer",
+              "path": "Tutorials/Part-8.md"
+            },
+            {
+              "text": "9: Authors: User Interface",
+              "path": "Tutorials/Part-9.md"
+            },
+            {
+              "text": "10: Book to Author Relation",
+              "path": "Tutorials/Part-10.md"
             }
           ]
         }