Make Sanity studio previewable with live preview

[EmilEinarsen]

The current implementation is great, but it doesn't give you the greatest overview of the changes effect on the website.
It would be cool to explore Sanity's preview mode so that we could get realtime-response on the affects our changes makes to the website.
Resources:

• This remix project uses preview, we can piggy back on it as an example implementation.
• There's also a more official example with NextJS that could be useful.

[EmilEinarsen]

Ended up following this official article from Sanity
https://www.sanity.io/guides/remix-run-live-preview