Update prog_server notebook

[lymichelle21]

• Add table of contents
• Fix formatting

[github-actions]

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• Reviewer (someone other than author) should look for bugs, efficiency, readability, testing, and coverage in examples (if relevant).
• Ensure that each PR adding a new feature should include a test verifying that feature.
• All errors from static analysis must be resolved.
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[kjjarvis]

Just one quick typo!

[kjjarvis]

Looks great!