feat(kubernetes): add private cluster connection page

[SamyDjemai]

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Description

Added Kubernetes how-to page, closes #5779

[bene2k1]

Hello @SamyDjemai ,

Thank you for your contribution to Scaleway's Product Documentation.
Your PR has been reviewed and merged. The documentation will be available with the next release of our documentation website.

Benedikt

[SamyDjemai]

Hi @bene2k1, I noticed that you deleted the Write for the Community program doc in #5952, is my PR still eligible for a Cloud credit reward, given that it was merged before you deleted the program doc? Thanks

[bene2k1]

Hello @SamyDjemai,

Yes, your contribution is still eligible for a cloud credit reward.
I have sent you an email as I need some more details about your Scaleway account to be able to credit it :)

Benedikt