core: use class based code

src/templates/page.jinja

@@ -14,9 +14,10 @@
         {% for image in images %}
             <div class="image-container">
                 <div class="image-container-element">
-                    <img src='{{ image[0] }}'>
-                    {% if image | length > 1 %}
-                        <a class="export" href="{{ image[1] }}">export file</a>
+                    <img src='{{ image[1] }}'>
+                    <a href="{{ image[0] }}">Large</a>
+                    {% if image|length > 2 %}
+                        <a class="export" href="{{ image[2] }}">export file</a>
                     {% endif %}
                 </div>
             </div>