Remove main command

[lodenrogue]

I think it would look cleaner if we removed the main command all together.

Instead of running

bangen main --list-effects

We could have something like the original documentation:

bangen --list-effects

In order to do that we need to update the parser main function like this:

@app.callback(
    invoke_without_command=True,
    context_settings={"allow_extra_args": True, "ignore_unknown_options": False},
)
def main(
    ctx: typer.Context,
    text: Annotated[
        str | None, 
        typer.Argument(help="The text string to render into an ASCII banner.")
    ] = None,
    version: Annotated[
        bool,
        typer.Option(
            "--version",
            "-v",
            help="Show version and exit",
            is_eager=True,
            callback=version_callback,
        ),
    ] = False,
    ...

And then we can simplify app.py:

def main() -> None:
    from bangen.cli.parser import app as cli_app
    from bangen.cli.parser import has_cli_args
 
    if has_cli_args():
        cli_app()
    else:
        from bangen.presets.manager import PresetManager
        from bangen.rendering.engine import RenderEngine
        from bangen.tui.app import TUIApp
 
        engine = RenderEngine()
        pm = PresetManager()
        tui_app = TUIApp(engine, pm)
        tui_app.run()

We would also need to revert back the README changes I added for the more clean look. Let me know if you like this and I can code it up, test it, and submit a PR.

[programmersd21]

done @lodenrogue https://github.com/programmersd21/bangen/releases/tag/2.3.1