apply custom header to page_presentation.html

lib/views/page_presentation.html

@@ -6,6 +6,8 @@
     <meta name="apple-mobile-web-app-status-bar-style" content="black-translucent" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
 
+    {{ customHeader() }}
+
     <!-- polyfills for IE11 -->
     <script>
       var userAgent = window.navigator.userAgent.toLowerCase();