Change directories to debian based systems

.gitlab-ci.yml

 default:
   script:
     - pelican content/
-    - rm -rf /usr/share/nginx/html/*
-    - cp -R output/* /usr/share/nginx/html/
\ No newline at end of file
+    - rm -rf /var/www/html/*
+    - cp -R output/* /var/www/html/