Add Copy Markdown to Tailwind

I often find myself copy-pasting some things, sometimes when I am not connected to an MCP. So would like a copy page button like https://stately.ai/docs/xstate

<img width="1594" height="1194" alt="Image" src="https://github.com/user-attachments/assets/9f566686-e22c-4f9e-8390-519cca3cc57e" />