hide toggle button by default

Author: sarahs

includes/toggle-images.html

@@ -1,6 +1,6 @@
-<button class="toggle-images tooltipped tooltipped-n" id="js-toggle-images">
-  <span id="js-hide-icon" aria-label="{% data ui.toggle_images.hide %}">{% octicon "eye-closed" %}</span>
-  <span id="js-show-icon" aria-label="{% data ui.toggle_images.show %}">{% octicon "eye" %}</span>
+<button class="toggle-images tooltipped tooltipped-n" id="js-toggle-images" style="display: none;">
+  <span id="js-hide-icon" aria-label="{% data ui.toggle_images.hide %}" style="display: none;">{% octicon "eye-closed" %}</span>
+  <span id="js-show-icon" aria-label="{% data ui.toggle_images.show %}" style="display: none;">{% octicon "eye" %}</span>
   <span id="js-hide-single-image" aria-label="{% data ui.toggle_images.hide_single %}" style="display: none;"></span>
   <span id="js-show-single-image" aria-label="{% data ui.toggle_images.show_single %}" style="display: none;"></span>
 </button>