fix: barretenberg readme scare warning (#9313)

This was unfortunately moved where it can't be seen by people choosing
to incentivize aztec repos

barretenberg/README.md

@@ -1,3 +1,9 @@
+> [!WARNING]
+> :warning: This is not an actively developed repository, it is a mirror. See <https://github.com/AztecProtocol/aztec-packages> :warning:
+
+> [!WARNING]
+> :warning: **<https://github.com/AztecProtocol/barretenberg> is a mirror-only repository, please only use <https://github.com/AztecProtocol/aztec-packages>. Do not use this for any purpose other than reference.** :warning:
+
 ![banner](../.github/img/bb_banner.png)
 
 # Barretenberg
@@ -32,12 +38,6 @@ Barretenberg (or `bb` for short) is an optimized elliptic curve library for the
     - [Improving LLDB Debugging](#improving-lldb-debugging)
     - [Using Tracy to Profile Memory/CPU](#using-tracy-to-profile-memorycpu)
 
-> [!WARNING]
-> :warning: This is not an actively developed repository, it is a mirror. See <https://github.com/AztecProtocol/aztec-packages> :warning:
-
-> [!WARNING]
-> :warning: **<https://github.com/AztecProtocol/barretenberg> is a mirror-only repository, please only use <https://github.com/AztecProtocol/aztec-packages>. Do not use this for any purpose other than reference.** :warning:
-
 > [!CAUTION]
 > **This code is highly experimental, use at your own risk!**