News item on UN PET Lab working paper

[curt-mitch-census]

Pull Request

Description

Adds news item on the publication of xD's working paper: https://www.census.gov/library/working-papers/2024/comm/mitchell-et-al.html

Related Issue

N/A

Changes Made

New markdown file and image for news item

Screenshots (if applicable)

N/A

Checklist

• I have read the CONTRIBUTING.md document.
• My code follows the project's coding standards.
• I've included leading slashes in the image reference to prevent Open Graph image issues
• I have added tests that prove my fix is effective or that my feature works.
• All new and existing tests passed.
• I have updated the documentation accordingly.
• The title of my pull request is a short description of the changes.
• My pull request is assigned to the appropriate milestone.

Additional Notes

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