Para::Frame::Site::Dir - Represents a directory in the site
Represents a directory in the site.
This class inherits from Para::Frame::Dir and Para::Frame::Site::File.
Para::Frame::Site::Dir->new(\%args)
Returns a Para::Frame::List with Para::Frame::Site::Dir objects.
We get the parent Para::Frame::Site::Dir object.
Returns undef if we trying to get the parent of the Para::Frame::Site/home.