Revise Advanced Features section

[e-BaMaMe]

There are some redundancies with the previous part. For now, section was deleted from manuscript (in GitHub and GitLab subchapters), but requires some further thought.

[e-BaMaMe]

https://github.com/t4d-gmbh/ci-cd-workflows/blob/e074d8cf319e43e837ff8029f6289238bbf7069f/source/content/creating_workflows/github_workflows/advanced.md

https://github.com/t4d-gmbh/ci-cd-workflows/blob/d6e1021175e03d85b6d628afc959c63f08e05f1c/source/content/creating_workflows/gitlab_pipelines/index.md