Profile authoring tutorial

[david-waltermire]

Committer Notes

This feature branch is for further development and refinement of the profile authoring tutorial.

Resolves #645.

All Submissions:

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By submitting a pull request, you are agreeing to provide this contribution under the CC0 1.0 Universal public domain dedication.

Changes to Core Features:

• [ ] Have you added an explanation of what your changes do and why you'd like us to include them?
• [ ] Have you written new tests for your core changes, as applicable?
• [ ] Have you included examples of how to use your new feature(s)?
• [ ] Have you updated all OSCAL website and readme documentation affected by the changes you made? Changes to the OSCAL website can be made in the docs/content directory of your branch.