Move security team docs from kubeflow/kubeflow

[thesuperzapper]

As part of the cleanup of the kubeflow/kubeflow repo (kubeflow/kubeflow#7643), this PR moves the ./security folder to the kubeflow/community repo.

I note that not much has been happening lately related to security, and I would like to see a proper security disclosure process set up at the very least. Probably using the built-in GitHub one initially.

/cc @akgraner @juliusvonkohout @kimwnasptd

[juliusvonkohout]

/lgtm

I note that not much has been happening lately related to security, and I would like to see a proper security disclosure process set up at the very least. Probably using the built-in GitHub one initially.

Yeah, it is a lack of time problem and i am more focused on reducing existing CVEs. Fo example KFP need to drop Python 3.7 and 3.8 as well as the deprecated visualizationserver.

See for example kubeflow/pipelines#11159 (comment)

/lgtm

[andreyvelich]

Thanks @thesuperzapper
/lgtm
/approve

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