[People Skills] Update skills setup doc and MAC screenshots

[shae-hurst]

Previous screenshot is inaccurate, MAC does not look like that anymore, and skills settings need to be accessed via the Data tab.

[github-actions]

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[learn-build-service-prod]

Learn Build status updates of commit a4c5b13:

✅ Validation status: passed

File	Status	Preview URL	Details
copilot/media/people-skills-inferencing/quick-setup-with-out-of-the-box-library.png	✅Succeeded
copilot/people-skills-setup.md	✅Succeeded

For more details, please refer to the build report.