Add section to default layout

Author: adeen-s

_layouts/default.html

@@ -1,5 +1,7 @@
 {% include header.html %}
-<div class="container content">
-    {{ content }}
-</div>
+<section class="section">
+    <div class="container content">
+        {{ content }}
+    </div>    
+</section>
 {% include footer.html %}