Promote lectures to the intro series and update related files#405

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mmcky merged 11 commits intomainfrom

promote-sandpit

Mar 23, 2024

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Tom's March 20 edits of intro lectures
thomassargent30
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Commits on Mar 21, 2024

Commits on Mar 22, 2024

Tom's edit of toc file temporarily to remove two less complete lectures
thomassargent30
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Commits on Mar 23, 2024

update doc reference for XXX in text
HumphreyYang
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