PROBLEM:
The "Kustomize" tutorial has hardcoded code blocks and hasn't been
updated to use the automated testscript workflow.
SOLUTION:
Create a test for the Kustomize tutorial.
Create a testscript for the Kustomize test.
Update the Kustomize MDX file to load in data from the testscript directory.
OUTCOME:
The code content in the Kustomize tutorial now comes directly from the
testscript workflow.
This commit removes the extra `./platform` argument from any of the
current tutorial/topic docs to reflect the change that was made to
`holos render platform` in version `0.100.0`.
