Update link to PNAS special feature

Update link to PNAS special feature ("Beyond Cases and Deaths...")

Author: christymelucci

content/about/news/headless/2021_12_14_pnas.md

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-The Proceedings of the National Academy of Sciences Special Feature, ["Beyond Cases and Deaths: The Benefits of Auxiliary Data Streams In Tracking the COVID-19 Pandemic"](https://www.pnas.org/content/118/51#BeyondCasesandDeathsTheBenefitsofAuxiliaryDataStreamsInTrackingtheCOVID-19Pandemic), highlights Delphi papers, including:
+The Proceedings of the National Academy of Sciences Special Feature, ["Beyond Cases and Deaths: The Benefits of Auxiliary Data Streams In Tracking the COVID-19 Pandemic"](https://www.pnas.org/topic/548), highlights Delphi papers, including:
 
  - [Epidemic Tracking and Forecasting: Lessons Learned from a Tumultuous Year](https://www.pnas.org/content/118/51/e2111456118)
  - [An Open Repository of Real-Time COVID-19 Indicators](https://doi.org/10.1073/pnas.2111452118)