Update Gardener info

[vlerenc]

• Gardener is a fully managed service, including day-1 and day-2 operations
• Gardener supports OpenStack (and Packet Cloud), which is often the foundation for on-premise installations

See e.g. adopters like https://bnerd.com which are offering a Gardener-based fully managed Kubernetes service in their own OpenStack DCs. More information at https://github.com/gardener/gardener/blob/master/ADOPTERS.md.

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[vlerenc]

CLA signed.

[vlerenc]

/assign @zacharysarah

[vlerenc]

Thanks for considering this PR @zacharysarah.

[zacharysarah]

/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: zacharysarah

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