Update gitlab-ci.yml

networking/Slides-adoc/gitlab-ci.yml

 make_slide_demo:
   script:
-    - cd courseware/slides
     - bundle config --local github.https true
     - bundle --path=.bundle/gems --binstubs=.bundle/.bin
     - bundle exec asciidoctor-revealjs -a revealjsdir=https://cdnjs.cloudflare.com/ajax/libs/reveal.js/3.6.0 slides.adoc
   artifacts:
     paths:
-    - courseware/slides/slides.html
+    - slides.html