Adding support for search plugin

templates/partials/search.html.twig

@@ -1,4 +1,16 @@
 <form class="search-box">
-    <input type="search">
+    <input type="search" placeholder="Search..." value="{{ query }}" data-search-input="{{ base_url_relative }}{{ config.plugins.simplesearch.route}}/query" />
+    <script>
+    jQuery(document).ready(function($){
+        var input = $('[data-search-input]');
+
+        input.on('keypress', function(event) {
+            if (event.which == 13 && input.val().length > 3) {
+                event.preventDefault();
+                window.location.href = input.data('search-input') + ':' + input.val();
+            }
+        });
+    });
+    </script>
     <i class="fa fa-search"></i>
 </form>