feat: add tea, update git credentials

nix/users/luca/git.nix

@@ -2,7 +2,7 @@
   enable = true;
   settings = {
     user = {
-      name = "rocketcamel";
+      name = "lucalise";
       email = "luca_lise@icloud.com";
     };
     init = {
@@ -15,6 +15,6 @@
   signing = {
     signByDefault = true;
     format = "ssh";
-    key = "~/.ssh/commits.id_ed25519.pub";
+    key = "~/.ssh/id_ed25519.pub";
   };
 }