Bun support

[igas]

Goals

To be able to run react-email with bun

Background

We recently moved all of our projects to bun, it would be good to support it here too.

Proposal

Update detect-package-manager with renovate to add the support. You can trigger update from dashboard #746

[shellscape]

I'm working on a replacement for the preview and CLI which doesn't need to dynamically install dependencies. Will keep everyone posted.