add dynamic system generation (#46)

systems/jeeves-jr/default.nix

@@ -0,0 +1,8 @@
+{ ... }:
+{
+  users = [
+    "alice"
+    "dennis"
+    "richie"
+  ];
+}

systems/palatine-hill/default.nix

@@ -0,0 +1,8 @@
+{ ... }:
+{
+  users = [
+    "alice"
+    "dennis"
+    "richie"
+  ];
+}

systems/programs.nix

@@ -34,6 +34,7 @@
     unzip
     ventoy
     wget
+    zip
     zoxide
     zsh-nix-shell
   ];