Add walk-through to Navi+

<!-- Navi+ insert Tour Guide library --->
<script src="https://unpkg.com/@sjmc11/tourguidejs/dist/tour.js" crossorigin="anonymous" referrerpolicy="no-referrer"></script>
<link rel="stylesheet" href="https://unpkg.com/@sjmc11/tourguidejs/dist/css/tour.min.css">
<script>
setTimeout(function() {
const tg = new tourguide.TourGuideClient();
tg.start();
}, 2000);
</script>
<!-- Navi+ insert Tour Guide library --->


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