add option to ignore the default .air.toml, for usage with "templ generate --notify-proxy"

[Dulanjala007]

I wanted to use air to notify templ proxy to reload but the "assets" folder was excluded in the config file, but since i was running the air via command without specifying any config, i thought command line arguments would be used but it was using the config all along and kept excluding "assets" folder no matter what i told in the command args

adding an option to ignore default config would be a good solution this. thanks!