Docs/build gen oscal instructions for gen_oscal and fix_any added to website.md

[fsuits]

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.
• All commits are signed-off.

Added instructions for developers on how to generate the oscal models from json.

[codecov]

Codecov Report

Merging #389 (3157ae2) into develop (fcbaa23) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #389   +/-   ##
========================================
  Coverage    98.99%   98.99%           
========================================
  Files           58       58           
  Lines         7066     7066           
========================================
  Hits          6995     6995           
  Misses          71       71           

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[butler54]

LGTM