What do you want and why?

I'd love to get help for blitz cli subcommands. i.e. run blitz db --help and see help output for the db subcommand.

Possible implementation(s)

I personally love https://github.com/cli/cli as it has the nicest help output of any CLI command. Works for subcommands too. Example:

❯ gh gist -h
Work with GitHub gists.

USAGE
  gh gist [flags

See the-road-to-graphql/fullstack-apollo-express-postgresql-boilerplate#5 for users domain. Maybe someone wants to add tests for the messages domain too.

What is the current behaviour?

Uncommented Ruby code doesn't get displayed to the client, like so:

paragraph text: 'I will be rendered'
# paragraph text: 'I will not be rendered' 

I think this is well, but sometimes we might want to deliver HTML comments. Therefore, I propose a comment static core component, based on [the W3 reference](https://www.w3schools.com/tags/tag_c