Update status in front matter

content/00.front-matter.md

@@ -44,6 +44,7 @@ Published: {{manubot.date_long}}
 This is a review paper that is authored by scientists for an audience of scientists to discuss research that is in progress.
 If you are interested in guidelines on testing, therapies, or other issues related to your health, you should not use this document.
 Instead, you should collect information from your local health department, the [CDC's guidance](https://www.cdc.gov/coronavirus/2019-ncov/index.html), or your own government.
+This project was most active from March 2020 through February 2023 and is not currently receiving major updates.
 ]{.banner .lightred}
 
 ## Authors {.unnumbered}