page.go
func (p *Page) DeleteCookie(name string) error {
	if err := p.session.DeleteCookie(name); err != nil {
		return fmt.Errorf("failed to delete cookie %s: %s", name, err)
	}
	return nil
}
func (p *Page) DeleteCookie(name string) error {
	if err := p.session.DeleteCookie(name); err != nil {
		return fmt.Errorf("failed to delete cookie %s: %s", name, err)
	}
	return nil
}
// DeleteCookie deletes a cookie on the page by name.