feat: add icons for directory viewer (#2441)

Author: jlguenego

lib/Server.js

@@ -401,7 +401,7 @@ class Server {
             return next();
           }
 
-          serveIndex(item)(req, res, next);
+          serveIndex(item, { icons: true })(req, res, next);
         });
       });
     } else if (
@@ -414,7 +414,7 @@ class Server {
           return next();
         }
 
-        serveIndex(contentBase)(req, res, next);
+        serveIndex(contentBase, { icons: true })(req, res, next);
       });
     }
   }