Add character image favicon

offline/index.html

@@ -4,6 +4,7 @@
     <meta charset="UTF-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <meta name="theme-color" content="#111827" />
+    <link rel="icon" type="image/png" href="%BASE_URL%favicon.png" />
     <title>홀로도리 계산기</title>
   </head>
   <body>

src/app.html

@@ -4,6 +4,7 @@
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
     <meta name="theme-color" content="#111827" />
+    <link rel="icon" type="image/png" href="%sveltekit.assets%/favicon.png" />
     %sveltekit.head%
   </head>
   <body data-sveltekit-preload-data="hover">