Fix wrong slash

Author: ethanhann

doc/website/default.twig

@@ -6,7 +6,7 @@
 
         <title>{{ title }}</title>
 
-        <link rel="stylesheet" href="{{ baseUrl }}/bower_components/bootswatch\paper/bootstrap.min.css">
+        <link rel="stylesheet" href="{{ baseUrl }}/bower_components/bootswatch/paper/bootstrap.min.css">
         <link rel="stylesheet" href="{{ baseUrl }}/bower_components/font-awesome/css/font-awesome.min.css">
         <link rel="stylesheet" href="{{ baseUrl }}/bower_components/highlightjs/styles/dark.css">
         <link rel="stylesheet" href="{{ baseUrl }}/css/main.css">