'Customize Message of the Day' example is out of date

The example at https://docs.cfengine.com/docs/master/examples-example-snippets-promise-patterns-example_edit_motd.html is out of date and doesn't work.

• It should use the _main_/main bundle functionality, the template file is not in the folder where it says it should be.
• Also is

    ## In order to get package inventory, we need to have a legacy package
    ## promise.
  

  still the case? And does it really have to be a legacy package promise? Is it even?

• Last but not least, it shouldn't use mustache template with no template_data (and thus use super-slow datastate() functionality).

I think this example is very important as a it provides some very nice functionality, shows many concepts and is probably a typical entry point for starting with CFEngine.