Remove unused support for "Disqus" from the page and post templates

We are not using Disqus. Remove it from the templates.

Change-Id: Id5e486d17e08dc8bb105db1b95e5d30df8cab51e
diff --git a/_config.yml b/_config.yml
index ce4c606..351434d 100644
--- a/_config.yml
+++ b/_config.yml
@@ -12,9 +12,6 @@
 company_name: Gerrit
 # this appears in the footer
 
-disqus_shortname:
-# if you're using disqus for comments, add the shortname here. if not, leave this value blank.
-
 google_analytics: UA-107829153-1
 # if you have google-analytics ID, put it in. if not, edit this value to blank.
 
diff --git a/_includes/disqus.html b/_includes/disqus.html
deleted file mode 100644
index 2481e4a..0000000
--- a/_includes/disqus.html
+++ /dev/null
@@ -1,25 +0,0 @@
-{% if site.disqus_shortname %}
-
-<div id="disqus_thread"></div>
-<script>
-    /**
-     *  RECOMMENDED CONFIGURATION VARIABLES: EDIT AND UNCOMMENT THE SECTION BELOW TO INSERT DYNAMIC VALUES FROM YOUR PLATFORM OR CMS.
-     *  LEARN WHY DEFINING THESE VARIABLES IS IMPORTANT: https://disqus.com/admin/universalcode/#configuration-variables
-     */
-
-    var disqus_config = function () {
-        this.page.url = "{{site.url}}/{{page.permalink}}";  // Replace PAGE_URL with your page's canonical URL variable
-        this.page.identifier = "{{page.permalink}}"; // Replace PAGE_IDENTIFIER with your page's unique identifier variable
-    };
-
-    (function() {  // REQUIRED CONFIGURATION VARIABLE: EDIT THE SHORTNAME BELOW
-        var d = document, s = d.createElement('script');
-
-        s.src = 'https://{{site.disqus_shortname}}.disqus.com/embed.js';  // IMPORTANT: Replace EXAMPLE with your forum shortname!
-
-        s.setAttribute('data-timestamp', +new Date());
-        (d.head || d.body).appendChild(s);
-    })();
-</script>
-<noscript>Please enable JavaScript to view the <a href="https://disqus.com/?ref_noscript" rel="nofollow">comments powered by Disqus.</a></noscript>
-{% endif %}
diff --git a/_layouts/page.html b/_layouts/page.html
index b472c21..f44eec6 100644
--- a/_layouts/page.html
+++ b/_layouts/page.html
@@ -52,8 +52,6 @@
         {% endif %}
     </div>
 
-{% include disqus.html %}
-
 </div>
 
 {{site.data.alerts.hr_shaded}}
diff --git a/_layouts/post.html b/_layouts/post.html
index d2273c0..50e6bcd 100644
--- a/_layouts/post.html
+++ b/_layouts/post.html
@@ -27,8 +27,6 @@
 
 </article>
 
-{% include disqus.html %}
-
 {{site.data.alerts.hr_shaded}}
 
 {% include footer.html %}