feat: new Web UI build system

- use generator-gulp-angular by @swiip
- remove old static file

webui/src/app/sections/providers/providers.controller.js

@@ -0,0 +1,28 @@
+(function () {
+  'use strict';
+
+  angular
+    .module('traefik.section.providers')
+    .controller('ProvidersController', ProvidersController);
+
+    /** @ngInject */
+    function ProvidersController($scope, $interval, $log, Providers) {
+      var vm = this;
+
+      vm.providers = Providers.get();
+
+      var intervalId = $interval(function () {
+        Providers.get(function (providers) {
+          vm.providers = providers;
+        }, function (error) {
+          vm.providers = {};
+          $log.error(error);
+        });
+      }, 2000);
+
+      $scope.$on('$destroy', function () {
+        $interval.cancel(intervalId);
+      });
+    }
+
+})();