home: jujutsu: explicitly create 'conf.d'

This is to serve as a reminder of _how_ to add a local configuration
file.

modules/home/delta/default.nix

@@ -84,7 +84,7 @@ in
             format = "git";
           };
 
-          pager = "delta";
+          pager = "${lib.getExe cfg.package}";
         };
       };
     };