Updated page for OSCAL mini workshops

[iMichaela]

Committer Notes

This PR updates the OSCAL mini workshop page with the latest presentations and video.

All Submissions:

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Changes to Core Features:

• [x] Have you added an explanation of what your changes do and why you'd like us to include them?
• [x] Have you written new tests for your core changes, as applicable?
• [x] Have you included examples of how to use your new feature(s)?
• [x] 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.