Migrate deployment from GitHub Pages to Vercel/Netlify

[HarshCasper]

Description

As of now, all our primary deployments happen on GitHub Pages. Though GitHub Pages is extremely versatile and mitigates the need for third-party integration, we can possibly look at using Vercel/Netlify for our purpose.

Using them brings a few advantages:

• We can integrate PR previews to automatically build PRs and use them for reviews.
• Both offer a generous free-tier and support open source projects.
• Both of the services offers an integrated CI/CD along with performance analytics and a great DX.

Considering both of the options would be helpful, as it can further pave the way to integrate Lighthouse CI with the PRs and have incremental CI/CD builds as more contributions are made.

[MikeCamel]

First question: is it entirely open source?
Second: what's the impact on our existing flow likely to look like?