Adding missing css parameter to head (#77)

Author: calbertts

tmpl/head.tmpl

@@ -19,9 +19,11 @@
   <link type="text/css" rel="stylesheet" href="https://jmblog.github.io/color-themes-for-google-code-prettify/themes/tomorrow-night.min.css">
   <link type="text/css" rel="stylesheet" href="styles/app.min.css">
   <link type="text/css" rel="stylesheet" href="styles/iframe.css">
+  <link type="text/css" rel="stylesheet" href="<?js= betterDocs.css ?>">
   <script async defer src="https://buttons.github.io/buttons.js"></script>
 
   <?js if (betterDocs.head) { ?>
     <?js= betterDocs.head ?>
   <?js } ?>
-</head>
+</head>
+