git: set init.defaultBranch to main

modules/git/default.nix

@@ -7,5 +7,7 @@
     userName = "ElnuDev";
     userEmail = "elnu@elnu.com";
     extraConfig.pull.rebase = true;
+    # Switch defaultBranch from master to main
+    extraConfig.init.defaultBranch = "main";
   };
 }