fixed article graphql refactoring, continued to improve graphql for materials

web/themes/custom/materiotheme/vuejs/components/Pages/Blabla.vue

@@ -5,7 +5,7 @@
     </div>
     <div class="cards-list" v-else>
       <ul>
-        <li v-for="item in items" v-bind:key="item.uuid">
+        <li v-for="item in items" v-bind:key="item.nid">
           <ArticleCard :item="item"/>
         </li>
       </ul>