`mix igniter.new` doesn't support `--help` directly.

[jimsynz]

Describe the bug
I keep typing mix igniter.new --help looking for a list of available options, except I get the following error:

Required positional argument missing: project_name.

Usage:

    mix igniter.new project_name [options]

To Reproduce

$ mix igniter.new --help

Expected behavior

It should output the same output as mix help igniter.new.

** Runtime

• Elixir version 1.18.1
• Erlang version 27.2
• OS macOS Sequoia 15.2 (24C101)
• Igniter version 0.5.6
• any related extension versions

[zachdaniel]

Closing as mostly a duplicate of #182

We want --help to be handled by igniter, not the individual task, and display the task docs etc.

[zachdaniel]

nvm, igniter.new is a special case and it needs its own --help handling. Not a duplicate.

[zachdaniel]

The main thing is that mix tasks get help with mix help task_name, and we would just look for --help for any igniter task and run and output mix help this.task.

[jimsynz]

The main thing is that mix tasks get help with mix help task_name, and we would just look for --help for any igniter task and run and output mix help this.task.

That seems like the correct behaviour, yes.