Update home.html

Added gitter-sidecar plugin

_layouts/home.html

@@ -10,6 +10,7 @@
     {% endif %}
     {% include open-graph.html %}
     {% include analytics.html %}
+    {% include gitter-sidecar.html %}
     {% if author.google.plus %}<link rel="author" href="https://plus.google.com/{{ author.google.plus }}"/>{% endif %}
 
     <link rel="canonical" href="{{ page.url | replace:'index.html','' | prepend: site.url }}">