Add copy button to code snippets

[happyRip]

Summary

A copy button for commands in code snippets.

Why do we need this ?

Users could press the button to copy whole code snippets instead of having to highlight the command and copy it with more mouse clicks/key presses.

The feature request was mentioned in the comments as well #227 (comment)

What is already there? What do you see now?

The commands are neatly displayed for users in code blocks.

What is missing? What do you want to see?

A button in a corner or above the code block to copy its content.

How do you propose to document this?

There are many guides explaining how to implement this feature:

• https://digitaldrummerj.me/hugo-add-copy-code-snippet-button/
• https://aaronluna.dev/blog/add-copy-button-to-code-blocks-hugo-chroma/
• https://codepen.io/a-luna/pen/JjYrejL

Can you do this yourself and submit a Pull Request?

I can do this myself and submit a PR. The design of the button would have to be made by a designer.