Update links to the PNAS special feature issue #733
Description
@ryantibs indicated that the link to Delphi's special feature ("Beyond Cases and Deaths...") must updated on the Delphi website due to an update on the PNAS website.
Updated/permanent link: https://www.pnas.org/topic/548
- Update link on About > News
- Update link on COVID-19 > About COVIDcast
- Search Delphi site for other instances, then update