Remove internal sysadmin server

this is now unused

src/routes/index.js

@@ -20,7 +20,6 @@ exports = module.exports = {
     services: require('./services.js'),
     settings: require('./settings.js'),
     support: require('./support.js'),
-    sysadmin: require('./sysadmin.js'),
     tasks: require('./tasks.js'),
     users: require('./users.js')
 };