Docs automation

[labra]

The documentation of the project will be available at: https://www.weso.es/shex-s/

We want to have the following features:

• Automatic generation of ScalaDoc. Currently available at API Docs
• Examples about how to invoke the library in Scala that are automatically compiled and checked that they run
• Some description of the architecture in markdown
• Automatic generation of the documentation. Currently with sbt docs/mdoc
• Automatic creation of website. It should be done with sbt docusaurusCreateSite
• Automatic publication of the documentation. It should be done with sbt docusaurusPublishSite. It is failing, there seems to be an error in ssh deploy_key.