chore: use out-of-store symlinks for ghostty and starship configs

Author: csamuel

home-manager/default.nix

@@ -15,11 +15,13 @@
 
   xdg.enable = true;
 
-  xdg.configFile."ghostty/config".source = ./../.config/ghostty/config;
+  xdg.configFile."ghostty/config".source =
+    config.lib.file.mkOutOfStoreSymlink "${repoRoot}/.config/ghostty/config";
   xdg.configFile."direnv/direnv.toml".source = ./../.config/direnv/direnv.toml;
   xdg.configFile."zed/settings.json".source =
     config.lib.file.mkOutOfStoreSymlink "${repoRoot}/.config/zed/settings.json";
-  xdg.configFile."starship.toml".source = ./../.config/starship.toml;
+  xdg.configFile."starship.toml".source =
+    config.lib.file.mkOutOfStoreSymlink "${repoRoot}/.config/starship.toml";
 
   home = {
     stateVersion = "24.05";