Move the logout logic to the auth manager
then this link will be a part of the menu. Otherwise, it
            will not be included in the menu items. Defaults to
            :code:`None`, meaning the item will always be present.
        Examples::
            appbuilder = AppBuilder(app, db)
            # Register a view, rendering a top menu without icon.
            appbuilder.add_view(MyModelView(), "My View")
            # or not instantiated
            appbuilder.add_view(MyModelView, "My View")
            # Register a view, a submenu "Other View" from "Other" with a phone icon.
            appbuilder.add_view(
                MyOtherModelView,
                "Other View",
                icon='fa-phone',
                category="Others"
            )
            # Register a view, with category icon and translation.
            appbuilder.add_view(
                YetOtherModelView,
                "Other View",
                icon='fa-phone',
                label=_('Other View'),
                category="Others",
                category_icon='fa-envelop',
                category_label=_('Other View')
            )
            # Register a view whose menu item will be conditionally displayed
            appbuilder.add_view(
                YourFeatureView,
                "Your Feature",