Improve search

This new approach makes sure the input field is hidden on browsers which
ignore `display:none`, such as w3m or lynx.

templates/posts.html

@@ -6,7 +6,7 @@
 
 {% block content %}
 	<h1>{{ section.title }}</h1>
-	<input class="search" type="search" placeholder="Search">
+	<div class="search-wrapper"></div>
 	{{ macros::list_posts() }}
 {% endblock content %}