adding favicon

index.php

@@ -210,6 +210,7 @@ function renderField(array $field, string $addressDisclaimerText): void
     <meta charset="utf-8">
     <meta name="viewport" content="width=device-width, initial-scale=1">
     <title><?= htmlspecialchars((string) $app['project_name']) ?></title>
+    <link rel="shortcut icon" href="favicon.png">
     <link rel="stylesheet" href="<?= htmlspecialchars(Bootstrap::url('assets/css/tokens.css')) ?>">
     <link rel="stylesheet" href="<?= htmlspecialchars(Bootstrap::url('assets/css/base.css')) ?>">
 </head>