site(cheat-sheet): show tooltip when icon, class or UTF copied
### Requirements

- [X] I have searched the [issues](https://github.com/ryanoasis/nerd-fonts/issues) for my request and found nothing related or helpful
- [X] I have checked the [FAQ](https://github.com/ryanoasis/nerd-fonts/wiki/FAQ-and-Troubleshooting) for help
- [X] I have reviewed the [Wiki](https://github.com/ryanoasis/nerd-fonts/wiki) for relevant information

### Problem Description

Now it is a little difficult to understand if icon, class or UTF code is copied in website cheat-sheet page, because nothing says you about this.

### Desired Solution

Maybe we need to add tooltip when something is copied. It can look like this:
![image](https://github.com/user-attachments/assets/7ee5ba93-440d-4507-877a-b600ca5a509c)


### Alternatives Considered

_No response_

### Additional Context

It can look like this:
![image](https://github.com/user-attachments/assets/7ee5ba93-440d-4507-877a-b600ca5a509c)