.PageHeader__nav should contain the primary navigation
.PageHeader__subnav is for all the secondary links we may need to provide
Both nav and subnav supports lists within a .Popover as a dropdown
Add .PageHeader__logo--internal to .PageHeader__logo for internal facing pages or when a user is logged into any Dreamhost system. Add .PageHeader--light to .PageHeader for a white background header & .PageHeader--transparent for a transparent background, so that the header may be overlayed on top of an image or gradient.