guest role; guide section ticking

plugins/guides/plugin.py

@@ -90,6 +90,10 @@ class GuidesPlugin(BasePlugin):
                 'icon': 'book-open',
                 'route': '/guides',
                 'position': 8,
+                # The nav endpoint hides an item whose permission the caller
+                # does not hold, so a signed-out visitor sees Guides only when
+                # the guest role has been granted guides.view.
+                'permission': 'guides.view',
             },
         ]