html: add noto sans subset

html/index.html

@@ -7,8 +7,13 @@
 <body style="background-color: #0e0e0e; overflow: hidden;">
 
     <style>
+        @font-face {
+            font-family: "Noto Sans";
+            src: url("/checkpoint/NotoSans.woff");
+        }
+
         * {
-            font-family: serif;
+            font-family: "Noto Sans";
         }
 
         .middle-box {