Quick fix to access the correct css files

Author: xFrednet

util/gh-pages/index.html

@@ -9,12 +9,11 @@
     <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.6/css/bootstrap.min.css"/>
     <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.5.0/styles/github.min.css"/>
 
-    <!-- This stylesheet is linked to a specific version to ensure that the link stays static even if mdbook does some refactoring. -->
-    <!-- gitcdn is used to get the css file as a stylesheet content type. It's open source and published under the GLP-3.0 License -->
-    <link rel="stylesheet" href="https://gitcdn.xyz/cdn/rust-lang/mdBook/v0.4.7/src/theme/css/variables.css"/>
-    <link id="styleHighlight" rel="stylesheet" href="https://gitcdn.xyz/repo/rust-lang/mdBook/master/src/theme/highlight.css" disabled="true">
-    <link id="styleNight" rel="stylesheet" href="https://gitcdn.xyz/repo/rust-lang/mdBook/master/src/theme/tomorrow-night.css">
-    <link id="styleAyu" rel="stylesheet" href="https://gitcdn.xyz/repo/rust-lang/mdBook/master/src/theme/ayu-highlight.css" disabled="true">
+    <!-- The files are not copied over into the Clippy project since they use the MPL-2.0 License -->
+    <link rel="stylesheet" href="https://rust-lang.github.io/mdBook/css/variables.css"/>
+    <link id="styleHighlight" rel="stylesheet" href="https://rust-lang.github.io/mdBook/highlight.css">
+    <link id="styleNight" rel="stylesheet" href="https://rust-lang.github.io/mdBook/tomorrow-night.css" disabled="true">
+    <link id="styleAyu" rel="stylesheet" href="https://rust-lang.github.io/mdBook/ayu-highlight.css" disabled="true">
     <style>
         blockquote { font-size: 1em; }
         [ng\:cloak], [ng-cloak], [data-ng-cloak], [x-ng-cloak], .ng-cloak, .x-ng-cloak { display: none !important; }