Add lots of snippets

docs/documentation/components/panel.html

@@ -152,14 +152,7 @@ variables:
       </p>
     </div>
 
-    <div class="columns">
-      <div class="column is-4">
-        {{panel_example}}
-      </div>
-      <div class="column">
-        {% highlight html %}{{panel_example}}{% endhighlight %}
-      </div>
-    </div>
+    {% include snippet.html content=panel_example size="one-third" %}
 
     {% include variables.html %}