def nav content = nil, options = nil, html_options = nil, &block
      options = options || {}
      @items << UiBibz::Ui::Core::Navigations::NavbarNav.new(content, options, html_options).tap(&block)
    end
def nav content = nil, options = nil, html_options = nil, &block
      options = options || {}
      @items << UiBibz::Ui::Core::Navigations::NavbarNav.new(content, options, html_options).tap(&block)
    end
Add navbar nav items
 See UiBibz::Ui::Core::NavbarNav