Move documentation to open doc framework

[bsctl]

As part of CNCF Sandbox project onboarding #812, we're moving to a separate neutral GitHub organization. Currently the documentation website is tied to a custom layout published from a private account in Netlify.

We should move to a standard documentation framework as, for example MKDocs and published from GitHub Pages.

[oliverbaehler]

@bsctl did you have already the change to start with this? This one seems to be popular as well: https://github.com/facebook/docusaurus. I am asking because we might have some dependencies regarding the CLO scoring to the documentation

[bsctl]

@oliverbaehler yep have a PR draft ready.

[Vrashabh-Sontakke]

I want to contribute to moving docs