fix typo in directory name

.gitlab-ci.yml

@@ -14,11 +14,10 @@ pages:
       Rscript -e "install.packages('openxlsx')"
       #session 4
       Rscript -e "install.packages(c('ghibli', 'nycflights13','viridis','ggrepel'))"
+    - quarto render
     - |
-      # rendering
-      quarto render
       # manage mpg.csv file by hand because it is strangely missing
-      cp session2/mpg.csv public/session2/mpg.csv
+      cp session_2/mpg.csv/mpg.csv public/session_2/mpg.csv
   interruptible: true
   artifacts:
     paths: