Update docs.json: Add tutorial in nav

docs/docs.json

@@ -29,6 +29,12 @@
               "configurations/using-ollama-models",
               "configurations/using-gpu"
             ]
+          },
+          {
+            "group": "Tutorials",
+            "pages": [
+              "tutorial/generate-presentation-over-api"
+            ]
           }
         ]
       }
@@ -70,4 +76,4 @@
       "github": "https://github.com/presenton/presenton"
     }
   }
-}
+}