feat: Articles store integration (#5133)

app/javascript/dashboard/api/helpCenter/portals.js

@@ -1,9 +1,16 @@
+/* global axios */
 import ApiClient from '../ApiClient';
 
 class PortalsAPI extends ApiClient {
   constructor() {
     super('portals', { accountScoped: true });
   }
+
+  getArticles({ pageNumber, portalSlug, locale }) {
+    return axios.get(
+      `${this.url}/${portalSlug}/articles?page=${pageNumber}&locale=${locale}`
+    );
+  }
 }
 
 export default new PortalsAPI();