chore(noir-contracts): update readme (#13563)

Current prose is unacceptable

Co-authored-by: ludamad <[email protected]>

Author: Maddiaa0

noir-projects/noir-contracts/README.md

@@ -1,3 +1,3 @@
-# Aztec Example Contracts
+## Noir Contracts
 
-You're smart enough to figure it out.
+A series of example aztec-nr smart contracts used in our end to end testing flow