use swap font

Author: fzaninotto

docs/_layouts/default.html

@@ -46,7 +46,7 @@
         />
         <link
             rel="stylesheet"
-            href="https://fonts.googleapis.com/icon?family=Material+Icons"
+            href="https://fonts.googleapis.com/icon?family=Material+Icons&amp;display=swap"
             media="print"
             onload="this.media='all'"
         />
@@ -86,7 +86,7 @@
             />
             <link
                 rel="stylesheet"
-                href="https://fonts.googleapis.com/icon?family=Material+Icons"
+                href="https://fonts.googleapis.com/icon?family=Material+Icons&amp;display=swap"
             />
             <link
                 rel="stylesheet"