[FEATURE] Add Clipboard Functionality for Code Snippets

[TheCedarPrince]

See this https://github.com/fredrikekre/fredrikekre.se/blob/0407af6060bd8aed8bae3e9666da8a1cf63eab0b/posts/direnv-with-julia/index.html#L290-L291 from @fredrikekre's website. And also see this file: https://github.com/fredrikekre/fredrikekre.se/blob/master/_libs/clipboard.js

Credit to Fredrik for this idea!