Drop maintenance banner (#1203)

The project is operational again, so the not-actively-maintained banner in the README is no longer accurate. This also updates the project board link to the correct URL.

Part of #174.

README.md

@@ -1,7 +1,4 @@
-[![Code of Conduct](https://img.shields.io/badge/%E2%9D%A4-code%20of%20conduct-blue.svg?style=flat)](https://github.com/edgi-govdata-archiving/overview/blob/main/CONDUCT.md)  [![Project Status Board](https://img.shields.io/badge/✔-Project%20Status%20Board-green.svg?style=flat)](https://github.com/orgs/edgi-govdata-archiving/projects/4)
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-
-⚠️ **This project is no longer maintained.** ⚠️ It may receive security updates, but we are no longer making major changes or improvements. EDGI no longer makes active use of this toolset and it is hard to re-deploy in other contexts.
+[![Code of Conduct](https://img.shields.io/badge/%E2%9D%A4-code%20of%20conduct-blue.svg?style=flat)](https://github.com/edgi-govdata-archiving/overview/blob/main/CONDUCT.md)  [![Project Status Board](https://img.shields.io/badge/✔-Project%20Status%20Board-green.svg?style=flat)](https://github.com/orgs/edgi-govdata-archiving/projects/32)
 
 
 # web-monitoring-db