Deploy pull request previews

**Is your feature request related to a problem? Please describe.**
- in the current workflow, in order for someone to review a pull request, they need to pull the changes to their machine and launch the site to preview.
- this includes many steps, and might
- slow down the review process
- in turn, discourage fellow developers in reviewing pull requests

**Describe the solution you'd like**
- setup a provider (vercel, netlify, or similar free provider) to deploy each pull request on a public URL.
- netlify reference: https://docs.netlify.com/site-deploys/overview/

**Describe alternatives you've considered**
- netlify and vercel support this feature out of the box,
- vercel reference: https://vercel.com/docs/git/vercel-for-github

**Additional context**
- installation of netlify needs to be permitted by the admins only.