[toc2] link complete font-awesome css from cdn

Author: jcb91

src/jupyter_contrib_nbextensions/templates/toc2.tpl

@@ -10,18 +10,7 @@
 
 <link rel="stylesheet" type="text/css" href="https://rawgit.com/ipython-contrib/jupyter_contrib_nbextensions/master/src/jupyter_contrib_nbextensions/nbextensions/toc2/main.css">
 
-<style type="text/css">
-@font-face {
-    font-family: 'FontAwesome';
-    src: url('https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.2.0/fonts/fontawesome-webfont.eot');
-    src: url('https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.2.0/fonts/fontawesome-webfont.eot?#iefix') format('embedded-opentype'),
-         url('https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.2.0/fonts/fontawesome-webfont.woff') format('woff'),
-         url('https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.2.0/fonts/fontawesome-webfont.ttf') format('truetype'),
-         url('https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.2.0/fonts/fontawesome-webfont.svg#fontawesomeregular') format('svg');
-    font-weight: normal;
-    font-style: normal;
-}
-</style>
+<link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
 
 <script src="https://rawgit.com/ipython-contrib/jupyter_contrib_nbextensions/master/src/jupyter_contrib_nbextensions/nbextensions/toc2/toc2.js"></script>