toc.md

1. Add the following code in Ghost admin Code Injection (Site Footer)

<script src="https://cdnjs.cloudflare.com/ajax/libs/tocbot/4.11.2/tocbot.js"></script>
<script>
  tocbot.init({
    tocSelector: '.toc',
    contentSelector: '.c-content', 
    hasInnerContainers: true
  });
</script>

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2. Open the post.hbs file and add the follwing before the {{ content }} line

<h3>Table of Content</h3>
<div class='toc'></div>

Built with Tocbot

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The result will be like