Consider auto-deploying PRs

[georgf]

The mozilla codetribute project has auto build & deploy of PRs set up through netlify (see e.g. mozilla-frontend-infra/codetribute#97).
We could consider something similar here.

[helfi92]

Codetribute is using a personal netlify account for the auto builds & deploy. @eliperelman sent a service request a while back to have a Netlify team account we can all use at Mozilla. @eliperelman, do you know if we have a team account now?

[eliperelman]

No, this is still in progress.