task.setOutputDir(extension.getUserManual().getStagingRoot().dir("render-multi").get().getAsFile());

            Map<String, Object> attributes = new HashMap<>();
            attributes.put("icons", "font");
            attributes.put("source-highlighter", "prettify");
            attributes.put("toc", "auto");
            attributes.put("toclevels", 1);
            attributes.put("toc-title", "Contents");