Show help text about Oh My Fish.
== USAGE
omf help [<command>]
omf <command> --help
omf <command> -h
== DESCRIPTION
If no arguments are given, the usage guide for the *omf* command will be printed to standard output.
If <command> is specified, the usage guide for <command> will be displayed. If <command> is an alias, it will be translated into the corresponding command.
== EXAMPLES
To display the text you are currently reading, you can run:
omf help help