maybe loading FA would help?

www/index.html

@@ -6,7 +6,7 @@
   <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no" />
   <link rel="stylesheet" href="css/bootstrap.min.css" />
   <link rel="stylesheet" href="css/autodoc.css" />
-
+  <script defer src="js/fontawesome-all.js"></script>
   <title>AutoDoc</title>
 </head>