[docs] Add direct links to component source and ARIA design pattern

Radix documentation has 2 links that are incredibly helpful:

- **View source**: links directly to the component’s implementation on GitHub.
- **ARIA design pattern**: links to the relevant WAI-ARIA Authoring Practices page (for example, the [Dialog (Modal) Pattern](https://www.w3.org/WAI/ARIA/apg/patterns/dialog-modal)).

These links make it much easier to understand implementation details and learn more about the underlying ARIA patterns.

I’m happy to collaborate on this and help with implementation, though it likely requires design input.

. . .

> Screenshot from Radix documentation showing these links
>