docs: add model redirect and clarify guidance

docs/docs.json

@@ -28,6 +28,14 @@
     {
       "source": "/cron/",
       "destination": "/cron-jobs"
+    },
+    {
+      "source": "/model",
+      "destination": "/models"
+    },
+    {
+      "source": "/model/",
+      "destination": "/models"
     }
   ],
   "navigation": {