remove model registry from DVC docs (#5473)

* remove model registry from DVC docs

* remove navigation in sidebar

* chore: trigger redeploy

Author: jendefig

content/docs/sidebar.json

@@ -61,25 +61,6 @@
             "slug": "experiment-pipelines"
           }
         ]
-      },
-      {
-        "label": "Model Registry",
-        "slug": "model-registry",
-        "source": "model-registry/index.md",
-        "children": [
-          {
-            "label": "Add a model",
-            "slug": "add-model"
-          },
-          {
-            "label": "Manage models",
-            "slug": "manage-models"
-          },
-          {
-            "label": "Use and deploy models",
-            "slug": "model-cicd"
-          }
-        ]
       }
     ]
   },