Update using Kaniko docs
What does this MR do and why?
Update and simplify the Kaniko docs. See also: https://github.com/GoogleContainerTools/kaniko/releases/tag/v1.9.0
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Edited by Achilleas Pipinellis