Optize font performance

assets/page.html

@@ -5,6 +5,8 @@
         <meta name="viewport" content="width=device-width, initial-scale=1" />
         <title>{{.Title}}</title>
         <link rel="icon" href="/_/favicon.ico" />
+        <link rel="preload" href="/_/fonts/IosevkaEtoile.woff2" as="font" type="font/woff2" crossorigin />
+        <link rel="preload" href="/_/fonts/IosevkaSlab.woff2" as="font" type="font/woff2" crossorigin />
         <link rel="stylesheet" href="/_/style.css" />
         <script src="/_/global-shortcuts.js"></script>
     </head>

assets/style.css

@@ -2,10 +2,12 @@
 @font-face {
     font-family: "Iosevka Etoile";
     src: url("/_/fonts/IosevkaEtoile.woff2") format("woff2");
+    font-display: swap;
 }
 @font-face {
     font-family: "Iosevka Slab";
     src: url("/_/fonts/IosevkaSlab.woff2") format("woff2");
+    font-display: swap;
 }
 
 /* === Theme === */