Add code repository mirrors

diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -7,6 +7,8 @@ use Ethereum for this purpose.
 
 Supersedes [alu.pm](https://github.com/ardislu/alu.pm).
 
+Code repository mirrors: [GitHub](https://github.com/ardislu/alu.bz), [Codeberg](https://codeberg.org/ardislu/alu.bz), [git.ardis.lu](https://git.ardis.lu/alu.bz)
+
 ## Testing locally
 
 To run the frontend and the backend at the same time: