adds a specific pubsub auth page matching Chat and Spaces

Author: umair-ably

src/data/nav/pubsub.ts

@@ -83,6 +83,10 @@ export default {
         },
       ],
     },
+    {
+      name: 'Authentication',
+      link: '/docs/authentication',
+    },
     {
       name: 'Connections',
       pages: [