rework update ui

- this is not modal anymore
- can be canceled

src/js/main.js

@@ -201,11 +201,6 @@ angular.module('Application').controller('MainController', ['$scope', '$route',
     });
 
     Client.onConfig(function (config) {
-        // check if we are actually updating
-        // if (config.progress.update && config.progress.update.percent !== -1) {
-        //     window.location.href = '/update.html';
-        // }
-
         if (config.cloudronName) {
             document.title = config.cloudronName;
         }