BUG: documentation still refers to porch in a number of places #4288
Description
Expected behavior
No references to porch in the kpt documentation
Actual behavior
There are still some references. There should be a single high-level reference to porch and point to the Nephio documentation, but no documentation describing the porch concepts in the kpt docs
Information
https://kpt.dev/guides/
https://kpt.dev/book/08-package-orchestration/
Anything relevant should be moved to porch