Add node version to web/README.md

Author: Fernando-A-Rocha

web/README.md

@@ -4,13 +4,13 @@
 
 The source code in this directory [(/web)](/web) is licensed under the GPLv3 license. See the [LICENSE](./LICENSE) file for more details.
 
-## Deployment
+## Development
 
-This static site is served with CloudFlare pages (this is not managed on this repository).
+Requires [Node.js](https://nodejs.org) version `20` or higher (`node -v` to check).
 
-## Development
+The site is built with [Astro](https://astro.build) and the [Starlight](https://starlight.astro.build) expansion.
 
-All commands are run from the root of the project (this folder), from a terminal:
+All commands are run from the root of the web project (this folder), from a terminal:
 
 | Command                   | Action                                           |
 | :------------------------ | :----------------------------------------------- |
@@ -20,3 +20,7 @@ All commands are run from the root of the project (this folder), from a terminal
 | `npm run preview`         | Preview your build locally, before deploying     |
 | `npm run astro ...`       | Run CLI commands like `astro add`, `astro check` |
 | `npm run astro -- --help` | Get help using the Astro CLI                     |
+
+## Deployment
+
+This static site is served with CloudFlare Pages (this is not managed on this repository), which uses Node.js to build the site and then serves the static files from the `dist` folder.