make header image a link to home

app/views/header.htm

@@ -1,6 +1,6 @@
 <check if="{{ @banner }}">
     <true>
-    <h1><img src="{{ @banner }}" alt="{{ @title }}" /></h1>
+    <a href="{{ @SITE_URL }}/"><h1><img src="{{ @banner }}" alt="{{ @title }}" /></h1></a>
     </true>
     <false>
     <h1>{{ @title }}</h1>