update footer

_includes/footer.html

@@ -1,10 +1,10 @@
 <div class="site-footer">
   <div class="wrapper">
-    <li>{{ site.title }}</li>
+    <h2>{{ site.title }}</h2>
 
-    <li><a href="{{site.github.owner_url }}">Github</a></li>
+    <a href="{{site.github.owner_url }}">Github</a>
     {% if site.twitter_username %}
-      <li><a href="https://twitter.com/{{ site.twitter_username }}">Twitter</a></li>
+      <a href="https://twitter.com/{{ site.twitter_username }}">Twitter</a>
     {% endif %}
   </div>
 </div>