USWDS-Site: Remove broken reference link on research page

[amyleadem]

Summary

Removed broken link from research page

Related issue

Closes #2184

Preview link

Preview link: Research page

Problem statement

This broken link is causing build errors on uswds-site: http://www.uxbooth.com/articles/an-analytics-first-approach-to-ux-part-1/

Solution

Removed the broken link per the recommendation from @jaclinec.

Possible future enhancements

• Review the content on the research page to make sure it is up-to-date and accurate.
• Consider finding a suitable replacement link for the reference section

Note
I've opened #2188 to review the content on the research page and consider a replacement this removed link.

Testing and review

• Confirm that the link is still broken
• Confirm that this update passes tests
• Confirm the changelog is accurate and free from error

[mahoneycm]

Looks great! Should we add a note to check the removed link in the future and add it back in the event that it's working again?

Tested:

• Link was removed
• Changelog item added
• HTML Proofer gives all links a pass

[mahoneycm]

Good catch 🥇

[amyleadem]

Thanks @mahoneycm. I've opened #2188 to review the content on the research page with a note about considering a replacement this removed link.