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