Docusarus v2 - ¿How to add new tabs for Doc in NavBar? - docusaurus

Question

I recently started using ** Docusaurus2 ** for tech notes in college.
I am interested in creating one or more Docs2, Docs3.
I have seen that it is a pluging that has to be duplicated. But with my config, it doesn't generate index.html for additionals tabs.
This is my folder list for docs: docs, dev. And in the dev folder some markdown files.
My docusaurus.config.js is:
module.exports = {
title: 'ApuntEs',
tagline: 'The tagline of my site',
url: 'https://your-docusaurus-test-site.com',
baseUrl: '/',
onBrokenLinks: 'throw',
onBrokenMarkdownLinks: 'warn',
favicon: 'img/favicon.ico',
organizationName: 'srlopez', // Usually your GitHub org/user name.
projectName: 'apuntes', // Usually your repo name.
themeConfig: {
navbar: {
title: 'ApuntEs',
logo: {
alt: 'ApuntEs',
src: 'img/logo.svg',
},
items: [
{
to: 'docs/',
activeBasePath: 'docs',
label: 'Docs',
position: 'left',
},
{to: 'dev/', activeBasePath: 'dev', label: 'Dev', position: 'left'},
{to: 'blog', label: 'Blog', position: 'left'},
{
href: 'https://github.com/facebook/docusaurus',
label: 'GitHub',
position: 'right',
},
],
},
footer: {
// omited
},
},
presets: [
[
'#docusaurus/preset-classic',
{
docs: {
id: 'doc',
sidebarPath: require.resolve('./sidebars.js'),
},
blog: {
showReadingTime: true,
},
theme: {
customCss: require.resolve('./src/css/custom.css'),
},
},
],
],
plugins: [
[
"#docusaurus/plugin-content-docs",
{
id: 'dev',
path: "dev", // Path to data on filesystem, relative to site dir.
routeBasePath: "dev", // URL Route.
include: ["**/*.md"],
sidebarPath: require.resolve('./sidebarsDev.js'),
},
],
],
};
It looks nice, but tab Dev doesn't work. The index.html is not generated on npx docusaurus build
and this is the version I am using.
npx docusaurus --version
2.0.0-alpha.70
May some one help me?