Add footer to default layout

_includes/footer.html

@@ -1,3 +1,3 @@
 <footer class="site-footer">
- <p>xmpp.dk - brought to you <a href="http://graffen.dk">Graffen</a> | XMPP: <a href="xmpp:graffen@xmpp.dk">graffen@xmpp.dk</a> | Email <a href="mailto:jesper@graffen.dk?subject=xmpp.dk">jesper@graffen.dk</a> (GnuPG: <a href="https://keybase.io/graffen/key.asc">0xcaebd4b2</a>)</p>
+  <img src="https://xmpp.net/badge.php?domain=xmpp.dk" />
 </footer>

_layouts/default.html

@@ -18,12 +18,7 @@
     <section class="main-content">
       {{ content }}
 
-      <footer class="site-footer">
-        {% if site.github.is_project_page %}
-          <span class="site-footer-owner"><a href="{{ site.github.repository_url }}">{{ site.github.repository_name }}</a> is maintained by <a href="{{ site.github.owner_url }}">{{ site.github.owner_name }}</a>.</span>
-        {% endif %}
-        <span class="site-footer-credits"></span>
-      </footer>
+      {% include footer.html %}
     </section>
   </body>
 </html>