added cactus theme files

hugo-content/themes/cactus/layouts/partials/comments/disqus.html

@@ -0,0 +1,17 @@
+<div id="disqus_thread">
+  <script type="text/javascript">
+    (function() {
+      // Don't ever inject Disqus on localhost--it creates unwanted
+      // discussions from 'localhost:1313' on your Disqus account...
+      // if (window.location.hostname == "localhost")
+      //     return;
+    
+      var dsq = document.createElement('script'); dsq.type = 'text/javascript'; dsq.async = true;
+      var disqus_shortname = '{{ if .Site.DisqusShortname }}{{ .Site.DisqusShortname }}{{ else }}{{ .Site.Title }}{{ end }}';
+      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>
+  <a href="https://disqus.com/" class="dsq-brlink">comments powered by <span class="logo-disqus">Disqus</span></a>
+</div>