code: function docTemplate(page) {
      return page.doclayout ||
        (page.notemplate && 'none') ||
        (page.nolayout && page.template) ||
        (generator.template$['doc-layout'] && 'doc-layout') ||
        layoutTemplate(page);
    }
docs: return name of document template for a page delegate to layoutTemplate if site has no doc template page.notemplate bypasses default templates and returns literal text