Disabled zapier if custom integrations are disabled

refs: https://github.com/TryGhost/Team/issues/510

- Use the new limit config to disable the Zapier integration if custom integrations are disabled

ghost/admin/app/controllers/integrations.js

@@ -7,6 +7,7 @@ import {task} from 'ember-concurrency';
 export default Controller.extend({
     settings: service(),
     store: service(),
+    config: service(),
 
     _allIntegrations: null,
 
@@ -15,6 +16,10 @@ export default Controller.extend({
         this._allIntegrations = this.store.peekAll('integration');
     },
 
+    zapierDisabled: computed('config.hostSettings.limits', function () {
+        return this.config.get('hostSettings.limits.customIntegrations.disabled');
+    }),
+
     // filter over the live query so that the list is automatically updated
     // as integrations are added/removed
     integrations: computed('_allIntegrations.@each.{isNew,type}', function () {

ghost/admin/app/routes/integrations/zapier.js

@@ -1,9 +1,11 @@
 import AuthenticatedRoute from 'ghost-admin/routes/authenticated';
 import CurrentUserSettings from 'ghost-admin/mixins/current-user-settings';
+import {computed} from '@ember/object';
 import {inject as service} from '@ember/service';
 
 export default AuthenticatedRoute.extend(CurrentUserSettings, {
     router: service(),
+    config: service(),
 
     init() {
         this._super(...arguments);
@@ -15,9 +17,15 @@ export default AuthenticatedRoute.extend(CurrentUserSettings, {
         });
     },
 
+    disabled: computed('config.hostSettings.limits', function () {
+        return this.config.get('hostSettings.limits.customIntegrations.disabled');
+    }),
+
     beforeModel() {
         this._super(...arguments);
+
         return this.get('session.user')
+            .then(this.transitionDisabled())
             .then(this.transitionAuthor())
             .then(this.transitionEditor());
     },
@@ -31,6 +39,12 @@ export default AuthenticatedRoute.extend(CurrentUserSettings, {
             .integrationModelHook('slug', 'zapier', this, transition);
     },
 
+    transitionDisabled() {
+        if (this.get('disabled')) {
+            this.transitionTo('integrations');
+        }
+    },
+
     buildRouteInfoMetadata() {
         return {
             titleToken: 'Zapier'

ghost/admin/app/templates/integrations.hbs

@@ -62,6 +62,7 @@
     <section class="gh-main-section">
         <h4 class="gh-main-section-header small">Built-in integrations</h4>
         <div class="apps-grid">
+            {{#unless this.zapierDisabled}}
             <div class="apps-grid-cell" data-test-app="zapier">
                 <LinkTo @route="integrations.zapier" data-test-link="zapier">
                 <article class="apps-card-app">
@@ -81,6 +82,7 @@
                 </article>
                 </LinkTo>
             </div>
+            {{/unless}}
 
             <div class="apps-grid-cell" data-test-app="slack">
                 <LinkTo @route="integrations.slack" data-test-link="slack">