fix: update readme with new url for code coverage badge

Author: vid277

README.md

@@ -1,6 +1,6 @@
 # Threshold
 
-[![cov](https://devflowinc.github.io/TheValut-nameTBD/badges/coverage.svg)](https://devflowinc.github.com/TheValut-nameTBD/actions)
+[![cov](https://raw.githubusercontent.com/devflowinc/threshold/refs/heads/gh-pages/badges/coverage.svg)](https://github.com/devflowinc/threshold/actions)
 
 This uses rust version 1.87