PROBLEM:
The "Hello Holos" tutorial has hardcoded code blocks and hasn't been
updated to use the automated testscript workflow.
SOLUTION:
* Create a test for the Hello Holos tutorial.
* Create a testscript for the Hello Holos test.
* Update the Hello Holos MDX file to load in data from the testscript directory.
OUTCOME:
The code content in the Hello Holos tutorial now comes directly from the
testscript workflow.
