Use a different theme.

_layouts/post.html

@@ -1,17 +1,7 @@
 ---
 layout: default
 ---
+<h2>{{ page.title }}</h2>
+<p class="meta">{{ page.date | date_to_string }}</p>
 
-<article class="post">
-  <h1>{{ page.title }}</h1>
-
-  <div class="entry">
-    {{ content }}
-  </div>
-
-  <div class="date">
-    Written on {{ page.date | date: "%B %e, %Y" }}
-  </div>
-
-  {% include disqus.html %}
-</article>
+{{ content }}