Fix invalid HTML caused by doubly-nested `<p>` element.

_layouts/post.html

@@ -23,7 +23,7 @@
 			<h1>{{ page.title }}</h1>
 		</header>
 		{% if page.image %}<span class="image main"><img src="{{ site.baseurl }}/{{ page.image }}" alt="" /></span>{% endif %}
-		<p>{{ content }}</p>
+		{{ content }}
 	</div>
 </section>
 
@@ -33,4 +33,4 @@
 
 </body>
 
-</html>
+</html>