[chore] Migrate from Netlify to Cloudflare

[andrewnicols]

What do we need to do?

I've been considering whether we should migrate from Netlify to Cloudflare as they may be more suited to our usecase.

Placeholder here to keep track of this possible change.

[kabalin]

The main problem with Cloudflare is that it can't build preview on PR from forks yet. Merging PR also does not delete a deployment from account. I read the other day someone wrote a custom solution for that based on API/hooks, so it might be possible to achieve some things, but out of box it is not very well designed for GH projects with external contributors.