Feature/ci slides setup

.gitlab-ci.yml

@@ -38,7 +38,7 @@ pages:
   stage: deploy
   script:
   - |
-    mkdir build && pushd build
+    mkdir build && cd build
       for MDFILE in ../slides/*.md; do
         TARGET=${MDFILE/.md/.html}
         pandoc -t revealjs -s --mathjax -o ${TARGET} ../slides/${MDFILE} \
@@ -46,7 +46,7 @@ pages:
               -V theme=${REVEAL_THEME} \
               --include-in-header=../slides/dumux_course.css
       done
-    popd build
+    cd ..
   - mkdir public && mv build/* public
   artifacts:
     paths: