Update: Google Tag Manager 및 Google Analytics 설정 추가

- Google Tag Manager 스크립트 유지
- Google Analytics 설정 추가 및 관련 스크립트 삽입

Author: realcoding2003

_layouts/default.html

@@ -22,6 +22,16 @@
     'https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);
     })(window,document,'script','dataLayer','GTM-T3KNH95M');</script>
     <!-- End Google Tag Manager -->
+
+    <!-- Google tag (gtag.js) -->
+    <script async src="https://www.googletagmanager.com/gtag/js?id=G-E2F9P3J8TQ"></script>
+    <script>
+    window.dataLayer = window.dataLayer || [];
+    function gtag(){dataLayer.push(arguments);}
+    gtag('js', new Date());
+
+    gtag('config', 'G-E2F9P3J8TQ');
+    </script>
 
     <!-- Fonts -->
     <link href="https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap" rel="stylesheet">