chore: update material icons font

src/index.html

@@ -1,4 +1,4 @@
-<!DOCTYPE html>
+<!doctype html>
 <html>
     <head>
         <meta charset="utf-8" />
@@ -26,7 +26,7 @@
             rel="stylesheet"
         />
         <link
-            href="https://fonts.googleapis.com/icon?family=Material+Icons"
+            href="https://fonts.googleapis.com/css2?family=Material+Icons"
             rel="stylesheet"
         />
         <script>