Move System Arguments page to Lookbook

[mperrotti]

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What are you trying to accomplish?

These changes generate a page for System Arguments in Lookbook so that we can remove the page from primer.style.

Integration

No known integration changes

List the issues that this change affects.

Closes https://github.com/github/primer/issues/2492

Risk Assessment

• Low risk the change is small, highly observable, and easily rolled back.
• Medium risk changes that are isolated, reduced in scope or could impact few users. The change will not impact library availability.
• High risk changes are those that could impact customers and SLOs, low or no test coverage, low observability, or slow to rollback.

What approach did you choose and why?

Took the existing args data and generated a .md.erb to create a new Lookbook page. A separate PR will be opened in primer/design that will remove the Systems Arguments page and update links to go to Lookbook.

Merge checklist

• Added/updated tests
• Added/updated documentation
• Added/updated previews (Lookbook)
• Tested in Chrome
• Tested in Firefox
• Tested in Safari
• Tested in Edge

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