in docs.js [205:212]
async function generateLayoutTemplate(targetPath, tpl) {
let codeTxt = await promises.readFile(targetPath, 'utf8');
codeTxt = codeTxt.toString()
codeTxt = codeTxt.replace(/(td-sidebar">)([\s\S]*)(<\/div>[\s\S]*<main)/, function (match, p1, p2, p3) {
return `${p1}\n${tpl}\n${p3}`
})
await promises.writeFile(targetPath, codeTxt, 'utf8');
}