Rearrange the verse template slightly

app/templates/verse.hbs

@@ -1,7 +1,20 @@
 <div class="container">
+  <h1>{{model.reference}}</h1>
+  <BsNav
+          @type="tabs"
+          @justified={{true}}
+          @stacked={{false}}
+          @fill={{true}} as |nav|
+  >
+    <nav.item>
+      <nav.link-to @route="index">Verse Details</nav.link-to>
+    </nav.item>
+    <nav.item>
+      <nav.link-to @route="verse">Commentary</nav.link-to>
+    </nav.item>
+  </BsNav>
   <div class="row">
     <div class="col-12">
-      <h1>{{model.reference}}</h1>
       <h4>Greek</h4>
       <p><Words::GreekText @model={{model.words}} /></p>
       <h4>ULB</h4>