remove duplicate button markup

Author: sarahs

includes/article.html

@@ -17,9 +17,7 @@ <h1 class="border-bottom-0">{{ page.title }}</h1>
           <button class="btn-link Link--secondary js-print tooltipped tooltipped-n" aria-label="Print this article">
             {% include printer-icon %}
           </button>
-          <button class="btn-link Link--secondary js-print tooltipped tooltipped-n" aria-label="Toggle images">
-            {% include toggle-images %}
-          </button>
+          {% include toggle-images %}
         </div>
       </div>
 

includes/toggle-images.html

@@ -1,4 +1,4 @@
-<button type="button" class="btn btn-outline ml-3 toggle-images" id="js-toggle-images" aria-selected="true">
+<button type="button" class="btn btn-outline ml-3 toggle-images tooltipped tooltipped-n" id="js-toggle-images" aria-selected="true" aria-label="Toggle images">
   <span id="js-hide-text">{% data ui.toggle_images.hide %}</span>
   <span id="js-show-text">{% data ui.toggle_images.show %}</span>
-</button>
+</button>