Add copy button to code samples

[lunchbreakdev]

Once #48 is merged there should be a copy button added to copy the code.

The code samples are setup as markdown files so there could be elements other than code displayed. Maybe extra setup info for each provder? Or even multiple code blocks.

This means that code buttons should be dynamically added to the pre blocks that enable users to copy the code to the clipboard. This would be similar to the ones on the main Redwood site and should probably be styled similarly to maintain consistency.

[dthyresson]

Once #48 is merged there should be a copy button added to copy the code.

All merged and ready for copy button.