Feature/factorio (#109)

* add factorio

* add factorio server

* add new user

* fixed typo

systems/jeeves-jr/default.nix

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

systems/palatine-hill/default.nix

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