fix: update gtag script

public/index.html

@@ -5,17 +5,15 @@
       var exports = {}
     </script>
     <!-- Google Tag Manager -->
+    <script async src="https://www.googletagmanager.com/gtag/js?id=G-94ZZEM10YJ"></script>
     <script>
-      ;(function(w, d, s, l, i) {
-        w[l] = w[l] || []
-        w[l].push({ 'gtm.start': new Date().getTime(), event: 'gtm.js' })
-        var f = d.getElementsByTagName(s)[0],
-          j = d.createElement(s),
-          dl = l != 'dataLayer' ? '&l=' + l : ''
-        j.async = true
-        j.src = 'https://www.googletagmanager.com/gtm.js?id=' + i + dl
-        f.parentNode.insertBefore(j, f)
-      })(window, document, 'script', 'dataLayer', 'GTM-PZJ7X57')
+      window.dataLayer = window.dataLayer || []
+      function gtag() {
+        dataLayer.push(arguments)
+      }
+      gtag('js', new Date())
+
+      gtag('config', 'G-94ZZEM10YJ')
     </script>
     <meta charset="utf-8" />
     <link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico" />