Remove icon, prefer automatic use of /favicon.ico of the host site.

frontend/admin/index.html

@@ -2,7 +2,6 @@
 <html lang="">
   <head>
     <meta charset="UTF-8" />
-    <link rel="icon" href="/src/assets/icon.webp" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
   <title>Admin</title>
   </head>

frontend/index.html

@@ -2,7 +2,6 @@
 <html lang="">
   <head>
     <meta charset="UTF-8">
-    <link rel="icon" href="/src/assets/icon.webp">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>Authentication</title>
   </head>