updating workshop text and some stale content fixes

[jeremywalter]

PR Description

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Reviewer Checklist

• [ ] spelling and grammar
• [ ] successful run of all installation and code chunks
• [ ] sufficient explanation and details for the tutorial content
• [ ] code syntax and naming convention
• [ ] adherence of tutorial format to style guide
• [ ] functional links (inter and intra)
• [ ] accessible hyperlink text (color blindness test)

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PR Checklist

• [ ] Release label added
• [ ] Category label added
• [ ] Clean build logs
• [ ] Linked related issues
• [ ] Ready for review
• [ ] Ready to merge