removes unused sidebar links

web/sidebar_spec_postgres.js

@@ -11,18 +11,6 @@ module.exports = {
       label: 'Managing Tables',
       items: ['reference/postgres/schemas', 'reference/postgres/tables'],
       collapsed: true,
-    },
-    {
-      type: 'category',
-      label: 'Replication',
-      items: ['reference/postgres/publications'],
-      collapsed: true,
-    },
-    {
-      type: 'category',
-      label: 'Database Configuration',
-      items: ['reference/postgres/database-passwords', 'reference/postgres/changing-timezones'],
-      collapsed: true,
     }
   ],
 }