update brand guidelines

[jbottum]

updated brand guidelines to CNCF and contact to ksc@kubelfow.org.

[thesuperzapper]

You may also want to update the Kubeflow website:

https://www.kubeflow.org/docs/about/community/#kubeflow-trademark

But also the current website is slightly incorrect, because I'm not aware of any jurisdictions in which the logo is a registered trademark (the wording is more correct on the readme from this PR, so perhaps we should update the Website to be more similar).

[terrytangyuan]

Thanks Josh!

/lgtm

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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[terrytangyuan]

/hold

[terrytangyuan]

Sorry seems like the merge bot didn’t see my hold on time yet. This looks good. If there are other comments, we can probably address in a follow-up PR.