Split domains into their own var file and update all files accordingly

modules/home/programs/terminal/git/default.nix

@@ -1,8 +1,8 @@
-{ pkgs, ... }:
+{ config, ... }:
 {
   programs.git = {
     enable = true;
     userName = "Jimbo";
-    userEmail = "jimbo@jimbosfiles.com";
+    userEmail = "jimbo@${config.domains.jim2}";
   };
 }