Align command format with other rails generator

[gilbertwat]

In Rails, we also have other generators to scaffold components. For example, For active admin,

Do we think it is a good idea to align some of the command arguments for --repo --app_services and --service to be domain-generator:app_services so on and so forth?

@radf0x

[radf0x]

good idea!

[gilbertwat]

Wow, thanks @radf0x dai lo for the speedy response.

Let me work on a PR. 🏌🏻‍♂️