Remove comments in dev environment (mmistakes#1363)

_layouts/single.html

@@ -63,7 +63,7 @@ <h4 class="page__meta-title">{{ site.data.ui-text[site.locale].meta_label }}</h4
       {% include post_pagination.html %}
     </div>
 
-    {% if site.comments.provider and page.comments %}
+    {% if jekyll.environment == 'production' and site.comments.provider and page.comments %}
       {% include comments.html %}
     {% endif %}
   </article>