fix: redact git user email from tracked gitconfig

Agent-Logs-Url: https://github.com/stanfish06/my-configs/sessions/227f3f47-a247-457f-ac5e-b9c39c3b6366

Co-authored-by: stanfish06 <93099613+stanfish06@users.noreply.github.com>

Author: Copilot

git/.gitconfig

@@ -3,7 +3,7 @@
     directory = /home/stan/nixos
 [user]
     name = Stan
-    email = zyyu@umich.edu
+    # email =
     signingkey = /home/stan/.ssh/id_ed25519.pub
 [gpg]
     format = ssh