[Feature]: Platform Operator can read docs to learn about how to add their own buildpacks

[tcdowney]

Blockers/Dependencies

No response

Background

As a Platform Operator
I want some lightweight documentation describing how to work with kpack
So that I can easily create my own ClusterBuilder or modify the default ClusterStore/ClusterBuilder to include additional buildpacks

Acceptance Criteria

GIVEN I am installing Korifi
WHEN I reference our kpack management docs
THEN I can understand how buildpack management works on Korifi, what buildpacks are included out of the box, and add my own buildpack (e.g. https://github.com/paketo-buildpacks/python)

Dev Notes

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• kpack tutorial docs
  • We shouldn't aim to recreate this entirely, but instead describe what is happening in Korifi + provide some simplified explanations. Anything more involved than that and we should just link back to the kpack project's own documentation.
• Relevant Slack thread: https://cloudfoundry.slack.com/archives/C0297673ASK/p1688743874201999