Setup Netlify for PR reviews

[p8]

It would be nice to have a preview of the documentation if changes are made.
This has been done for SDoc as well:
rails/sdoc#163

[st0012]

I'd love to see this happen as it'll make community contribution easier as well. Thanks for proposing ❤️

@hsbt Is Netlify a service we can integrate with Ruby organization?

[st0012]

Looks like we'll be using Cloudflare for this according to #1282 😄
Let's move the discussions there.