Feature/devops ci

[memsharded]

Very initial draft of the first sections, to get team early feedback.

It is better reviewed generating the html docs, not in code.

Depends on https://github.com/conan-io/examples2/pull/153

Close https://github.com/conan-io/docs/issues/3849 Close https://github.com/conan-io/conan/issues/3003 Close https://github.com/conan-io/conan/issues/6589 Close https://github.com/conan-io/conan/issues/6045 Close https://github.com/conan-io/conan/issues/8587 Close https://github.com/conan-io/conan/issues/16309