Disable browser autocomplete for the search field

The page already provides an autocomplete mechanism, so this patch
prevents the browser autocomplete dropdown from being displayed if
the search box is clicked twice.

templates/search.phtml

@@ -11,7 +11,7 @@
 <nav>
     <div class="wrapper">
         <div id="searchbar">
-            <input name="q" id="q" placeholder="Search" type="text">
+            <input name="q" id="q" placeholder="Search" type="text" autocomplete="off">
             <div id="searchicon" class="icon">search</div>
         </div>
     </div>