URL Redirect from a Live Blog Post

I have read plenty regarding URL mapping, and I understand the very essence of it is to redirect users from a dead page. I'm wondering if there is some magical code that can help me redirect a blog post that is active/live to another URL, either internal or external?

I am trying to figure a workaround for the lack of Gallery Block Summary with clickable links for 7.1, and I'm not getting far with something.

Add Code Block to blog post > Paste this code

<script>
         setTimeout(function(){
            window.location.href = 'https://beaverhero.com';
         }, 5000);
</script>