use "breadcrumbs"

ui/src/components/DoorMapEditor.vue

@@ -2,7 +2,7 @@
   <div class="box">
     <p class="title is-4">Türchen bearbeiten</p>
 
-    <div class="tabs is-centered">
+    <nav class="breadcrumb has-succeeds-separator" aria-label="breadcrumbs">
       <ul>
         <li
           v-for="(step, index) in steps"
@@ -13,9 +13,10 @@
           <a>{{ step }}</a>
         </li>
       </ul>
-    </div>
+    </nav>
 
     <DoorPlacer v-if="current_step === 0" />
+    <p v-if="current_step === 1">Narf!</p>
   </div>
 </template>