Switch Generated Website Content Link Checking to lychee from untitaker/hyperlink

[aj-stein-nist]

User Story:

As a NIST OSCAL developer, in order to ensure all links in the generated website content point to valid hyperlink targets in a faster and more efficient way with minimal configuration, I would to implement an alternative approach to link checking the generated content as part of CI workflows in GitHub Actions.

This closes #1201.

Goals:

When reviewing current work with Dave for the sprint, we reviewed #1201. The nokogiri dependency is needed for HTML proofer, which is tech debt from a previous iteration of proper link checking needed for generated HTML and was replaced in the interim by the Javascript-based untitaker/hyperlink in a published GitHub action. See 9a6eb48 for the current approach.

Goals of the replacement:

• Available in a stable, well-maintained GitHub Action
• As performant and fast as possible
• As little configuration out of the box needed as possible
  • Ability to exclude resources in an easy, configurable way
• Reliable reporting in a usable format

After using usnistgov/metaschema#204 as a quick in the moment spike, Dave and I agreed lychee and its officially published GH Action better fit the bill.

Dependencies:

Final completion and review of usnistgov/metaschema#204 once merged for final integration testing.

Acceptance Criteria

• Necessary GH Action workflow specifications and modified and reviewed by one or more team members.
• All OSCAL website and readme documentation affected by the changes in this issue have been updated. Changes to the OSCAL website can be made in the docs/content directory of your branch.
• A Pull Request (PR) is submitted that fully addresses the goals of this User Story. This issue is referenced in the PR.
• The CI-CD build process runs without any reported errors on the PR. This can be confirmed by reviewing that all checks have passed in the PR.

{The items above are general acceptance criteria for all User Stories. Please describe anything else that must be completed for this issue to be considered resolved.}

[aj-stein-nist]

I am going to move this from 1.0.3 ti 1.1.0 release for now @david-waltermire-nist, as I am out of office for the targeted completion of the sprint. Feel free to assign it to others and bring it back in, or I will pick it up when I am back.

[aj-stein-nist]

Alright, I am going to pick this up now after convo today during issue triage re #737.