Hello! First of all, thank you for your theme. I'm using it really well, but I'd like to add one more feature. If you look at this [link](https://themes.gohugo.io//theme/hugo-clarity/post/markdown-syntax/#code-block-with-hugos-internal-highlight-shortcode), you can see an `copy` icon when you mouse over the code block. <img width="864" alt="Screen Shot 2021-04-03 at 11 03 32 PM" src="https://user-images.githubusercontent.com/3617939/113480887-a7400b00-94d1-11eb-9b53-dbe834a254cc.png">
