Add Role-based paths for New Contributor Course

### Describe the issue

While the [New Contributor Course](https://www.kubernetes.dev/docs/onboarding/)(NCC) is an excellent self-paced document for contributors wishing to participate in Kubernetes for the first time, it makes the assumption that all lessons are equally applicable to all types of new contributors. Examples of ones where that might not be the case include:

* People who plan to only contribute to Docs
* Experienced Go programmers who contribute to other projects but are just new to Kubernetes

As such, it would be great to add a page to the NCC that gives some role-based advice on which lessons are critical for which profiles. The first part of this would be figuring out what distinct roles exist.

This should be done in coordination with @kaslin online new contributor sessions, where we'll get a lot of feedback from contributors themselves.

Thanks to Sandeep Kanabar for this idea.

/sig contributor-experience
/area mentoring
/help-wanted