Add Quaderno API to Redocusaurus' website showcase (#320)

* Reorder current showcase alphabetically

* Add Quaderno API to showcase

website/docs/who-is-using-redocusaurus.md

@@ -7,8 +7,9 @@ sidebar_position: 5
 Feel free to add your site below by sending a Pull Request! (sort in alphabetical order)
 
 - [ChatKitty API Docs](https://chatkitty.com/docs/rest/reference)
+- [Facturapi API Docs](https://docs.facturapi.io/api)
 - [Forem API Docs](https://developers.forem.com/api)
+- [Modrinth API Docs](https://docs.modrinth.com)
+- [Quaderno API](https://developers.quaderno.io/api)
 - [Regards OSS](http://regardsoss.github.io/) - [example](http://regardsoss.github.io/docs/development/backend/services/catalog/api-swagger)
 - [Wechaty OpenAPI](https://wechaty.js.org/docs/openapi/)
-- [Facturapi API Docs](https://docs.facturapi.io/api)
-- [Modrinth API Docs](https://docs.modrinth.com)