feat: new Web UI build system

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

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

@@ -0,0 +1,24 @@
+(function () {
+  'use strict';
+
+  angular
+    .module('traefik.section.providers', [
+      'traefik.core.provider',
+      'traefik.section.providers.backend-monitor',
+      'traefik.section.providers.frontend-monitor'
+    ])
+    .config(config);
+
+    /** @ngInject */
+    function config($stateProvider) {
+
+      $stateProvider.state('provider', {
+        url: '/',
+        templateUrl: 'app/sections/providers/providers.html',
+        controller: 'ProvidersController',
+        controllerAs: 'providersCtrl'
+      });
+
+    }
+
+})();