Remove CSS files that shouldn't be on rustdoc pages

These should only have been on the homepage.

Author: jyn514

templates/rustdoc/head.html

@@ -1,10 +1,4 @@
 {%- import "macros.html" as macros -%}
-        <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/pure/0.6.0/pure-min.css" type="text/css"
-            media="all" />
-        <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/pure/0.6.0/grids-responsive-min.css"
-            type="text/css" media="all" />
-        <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.6.3/css/font-awesome.min.css"
-            type="text/css" media="all" />
         <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/pure/0.6.0/menus-min.css" type="text/css"
             media="all" />
         <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/pure/0.6.0/grids-min.css" type="text/css"