[FEATURE] Add an outputs section to the generated documentation for GitLab CI/CD components

[erNail]

Feature Request

Motivation

Right now, the documentation generated for Gitlab CI/CD components shows only possible inputs.
When jobs use artifacts, it would be useful to document them as outputs as part of the documentation.

Proposed Solution

The artifacts keyword of each job would have to be parsed. In the documentation, the outputs should either be documented next to the inputs, or for each job.