index.html

<!DOCTYPE html>
<html>
<head>
<title>Sifa Clinic</title>
</head>

<body>
<script>

function getFacebookUrl() {
  
    let userAgent = navigator.userAgent || navigator.vendor || window.opera;

    // Windows Phone must come first because its UA also contains "Android"
    if (/windows phone/i.test(userAgent)) {
        return "fb://profile/100063563259367";
    }

    if (/android/i.test(userAgent)) {
        return "intent://profile/100063563259367#Intent;package=com.facebook.katana;scheme=fb;end";
    }

    // iOS detection from: http://stackoverflow.com/a/9039885/177710
    if (/iPad|iPhone|iPod/.test(userAgent) && !window.MSStream) {
        return "fb://profile/100063563259367";
    }

    return "https://facebook.com/sifaclinic";
}

let url = getFacebookUrl();

window.location.replace(url);

</script>
</body>

</html>