Added simply favicon

Author: HHMagnus

favicon.ico

@@ -6,6 +6,7 @@
     <meta name="keywords" content="Merge PDF, PDF merger, Offline merge pdf, Offline PDF Merger, WebAssembly pdf merger, client-side PDF merge, private PDF merge, secure PDF merge, client-side PDF merger, private PDF merger, secure PDF merger">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <meta name="author" content="Magnus Hindborg Hovmann">
+    <link rel="icon" type="image/x-icon" href="/favicon.ico">
     <title>Offline PDF Merger</title>
     <style>
     :root {