feat: show link label and title

[calebdw]

Closes #325

Hello!

This PR renders the various link attributes (if they exist) to prevent lose of context/information. It's also nice to automatically style the relevant info so the user doesn't have to manually do it when copying markdown links from other locations.

It turns out there's two other link attributes besides the url:

• label this is the portion between the brackets (a Text child of the Link node)
• title this is the portion between the double quotes inside the link (this is most often shown as a tooltip when hovering over the link/label)

* Links look like this [](https://example.com/)
* Links with titles look like this [](https://example.com/ "Example")
* Links with labels look like this [example](https://example.com/)
* Links with titles and labels look like this [example](https://example.com/ "Example")

I'm open to formatting suggestions, let me know what you think! We might could display this in a more markdown style (I kinda like this better):

Thanks!

[mfontanini]

Thanks!

[calebdw]

Thank you!