Feature: Add copy button to Bash codesnippets

[Asartea]

Because

It can be helpful to copy long and involved bash commands

This PR

• Adds a copy button to all code snippets
• Uses CSS to hide said button for all languages except bash

Issue

Closes #4416

Additional Information

Two notes:

• The way the CSS works, its hiding the entire toolbar, not just the copy button. The advantage of this is that we don't end up with a bunch of empty divs where the toolbar should be. The disadvantage is that if we ever add something else to that toolbar that would also get hidden, and it might not be immediately obvious why.
• I'm not entirely convinced by how the button actually works, but I think a possible redesign would be better suited for a follow up PR.

Pull Request Requirements

• I have thoroughly read and understand The Odin Project Contributing Guide
• The title of this PR follows the keyword: brief description of change format, using one of the following keywords:
  • Feature - adds new or amends existing user-facing behavior
  • Chore - changes that have no user-facing value, refactors, dependency bumps, etc
  • Fix - bug fixes
• The Because section summarizes the reason for this PR
• The This PR section has a bullet point list describing the changes in this PR
• I have verified all tests and linters pass after making these changes.
• If this PR addresses an open issue, it is linked in the Issue section

[KevinMulhern]

Looks great to me - thanks @Asartea