clean-up/Remove unused CDNs

Author: LewisYoul

app/views/layouts/application.html.erb

@@ -11,8 +11,6 @@
     <%= javascript_pack_tag 'snippet_app' %>
     <%= javascript_pack_tag 'application' %>
 
-    <link rel="stylesheet" href="https://cdn.rawgit.com/konpa/devicon/df6431e323547add1b4cf45992913f15286456d3/devicon.min.css">
-    <script src="https://kit.fontawesome.com/97e1edac97.js" crossorigin="anonymous"></script>
     <link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/10.0.1/styles/solarized-light.min.css">
     <script src="//cdnjs.cloudflare.com/ajax/libs/highlight.js/10.0.1/highlight.min.js"></script>
   </head>