Rename the `config` option to `dojorc`

Type: bug

The following has been addressed in the PR:

[x] There is a related issue
[x] All code has been formatted with prettier as per the readme code style guidelines
[x] Unit or Functional tests are included in the PR

Description:

Due to conflicts with dojo command options, rename the --config option used to specify the .dojorc file to --dojorc.

Resolves #293

dojo / cli