Add Disqus comments count to tag and best pages.

Author: yegor256

_layouts/tag-index.html

@@ -147,3 +147,5 @@ <h1>{{ page.posts.size }} posts about &ldquo;{{ page.tag }}&rdquo;</h1>
     </article>
   </div>
 </section>
+
+{% include disqus-count.html shortname="yegor256" %}

static/best.md

@@ -25,3 +25,5 @@ Here is the blog [contents](/contents.html).
 And don't forget to subscribe to my [monthly updates](/about-me.html).
 
 {{ site.categories['best'] | yb_tagged_list }}
+
+{% include disqus-count.html shortname="yegor256" %}