Refactor the documentation so we can list all the available sections

[agoncal]

Today in the "How Does This Workshop Work?" section, we explain the structure of the workshop:

The structure of this workshop is as follows:

• Installing all the needed tools:
  in this section, you will install all the tools and code to be able to develop, compile and execute our application
• Developing microservices with Quarkus:
  in this section, you will develop a microservice architecture by creating several Maven projects, write some Java code, add JPA entities, JAX-RS REST endpoints, write some tests, use an Angular web application, and all that on Quarkus
  ifdef::use-ai[]
• Artificial Intelligence:
  in this section, you will use OpenAI or Azure OpenAI to invoke an AI so you can generate a random narration of the fight
  endif::use-ai[]

It would be nice if we actually list all the section of workshop using the xref syntax in Asciidoc (eg. xref:azure.adoc#azure[xrefstyle=full])

The structure of this workshop is as follows:

• xref:installing.adoc#installing[xrefstyle=full]:
  in this section, you will install all the tools and code to be able to develop, compile and execute our application
• xref:developping.adoc#developping[xrefstyle=full]:
  in this section, you will develop a microservice architecture by creating several Maven projects, write some Java code, add JPA entities, JAX-RS REST endpoints, write some tests, use an Angular web application, and all that on Quarkus
  ifdef::use-ai[]
• xref:ai.adoc#ai[xrefstyle=full]:
  in this section, you will use OpenAI or Azure OpenAI to invoke an AI so you can generate a random narration of the fight
  endif::use-ai[]