Update mentoring Readme.md (Landing page from communityt.dev/mentoring)

[xcarolan]

Update mentoring Readme.md (Landing page from communityt.dev/mentoring)

Update with mentoring opportunities being planned and past mentoring events.

/sig contributor-experience
/area mentorship-planning

[k8s-ci-robot]

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[xcarolan]

/assign

[k8s-triage-robot]

The Kubernetes project currently lacks enough contributors to adequately respond to all issues.

This bot triages un-triaged issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
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/lifecycle stale