docs: move gendocs tool to dagger/dagger

Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>

tools/gendocs/README.md

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+<p align="center">
+  <img src="https://rocketseat-cdn.s3-sa-east-1.amazonaws.com/theme-docs.svg" alt="A illustration of file that is the @rocketseat/gatsby-theme-docs logo" width="100">
+</p>
+
+<h2 align="center">
+  Gatsby Starter: Rocket Docs
+</h2>
+
+<p align="center">
+  Out of the box Gatsby Starter for creating documentation websites easily and quickly. With support for MDX, code highlight, Analytics, SEO and more 🔥 Using the theme: <a href="https://github.com/Rocketseat/gatsby-themes/tree/main/%40rocketseat/gatsby-theme-docs">@rocketseat/gatsby-theme-docs</a>
+</p>
+
+<p align="center">
+  <img src="https://img.shields.io/badge/PRs-welcome-%238257E6.svg" alt="PRs welcome!" />
+
+  <img alt="License" src="https://img.shields.io/badge/license-MIT-%238257E6">
+
+  <a href="https://twitter.com/intent/follow?screen_name=rocketseat">
+    <img src="https://img.shields.io/twitter/follow/rocketseat.svg?label=Follow%20@rocketseat" alt="Follow @rocketseat" />
+  </a>
+</p>
+
+## 🚀 Features
+
+- 📝 MDX for docs;
+- 🛣 Yaml-based sidebar navigation;
+- 📱 Responsive and mobile friendly;
+- 🖥 Code highlighting with [prism-react-renderer](https://github.com/FormidableLabs/prism-react-renderer) and [react-live](https://github.com/FormidableLabs/react-live) support;
+- 🥇 SEO (Sitemap, schema.org data, Open Graph and Twitter tags).
+- 📈 Google Analytics support;
+- 📄 Custom docs schema;
+- 🖱 Table of Contents;
+- ⚡️ Offline Support & WebApp Manifest;
+- and much more 🔥
+
+## ⚡️ Getting started
+
+1. Create the website.
+
+   ```sh
+   npx gatsby new rocket-docs https://github.com/rocketseat/gatsby-starter-rocket-docs
+   ```
+
+2. Start developing.
+
+   ```sh
+   cd rocket-docs
+   gatsby develop
+   ```
+
+3. Are you ready for launch?
+
+   Your site is now running at `http://localhost:8000`
+
+## 📄 Docs
+
+Looking for docs? Check our live demo and documentation [website](https://rocketdocs.netlify.app).
+
+---
+
+Made with 💜 by Rocketseat :wave: [check our community!](https://discordapp.com/invite/gCRAFhc)