Add autofocus to input field

Supported in all major browsers, allows the user to immediately start typing after loading the page.

app/templates/index.html

@@ -28,7 +28,7 @@
             <img class="logo" src="/static/img/logo.png">
             <form action="/search" method="post">
                 <div class="search-fields">
-                    <input type="text" name="q" id="search-bar">
+                    <input type="text" name="q" id="search-bar" autofocus>
                     <input type="submit" id="search-submit" value="Search">
                 </div>
             </form>