add docs/ to generate github page

docs/_includes/disqus.html

@@ -0,0 +1,16 @@
+{% if site.disqus_shortname %}
+
+    <div id="disqus_thread"></div>
+    <script type="text/javascript">
+        /* * * CONFIGURATION VARIABLES: EDIT BEFORE PASTING INTO YOUR WEBPAGE * * */
+        var disqus_shortname = '{{site.disqus_shortname}}'; // required: replace example with your forum shortname
+
+        /* * * DON'T EDIT BELOW THIS LINE * * */
+        (function() {
+            var dsq = document.createElement('script'); dsq.type = 'text/javascript'; dsq.async = true;
+            dsq.src = '//' + disqus_shortname + '.disqus.com/embed.js';
+            (document.getElementsByTagName('head')[0] || document.getElementsByTagName('body')[0]).appendChild(dsq);
+        })();
+    </script>
+    <noscript>Please enable JavaScript to view the <a href="https://disqus.com/?ref_noscript">comments powered by Disqus.</a></noscript>
+{% endif %}