update script

.gitlab-ci.yml

+image: debian:latest
+
+stages:
+  - pages
+
 pages:
+  stage: pages
   script:
-  - mkdir public
-  - cd contents && cp -rp * ../public && cd ..
+  - mkdir .public
+  - rsync -avz --chmod=ug=rwX,o=rX --exclude .git/ --exclude .gitlab-ci.yaml contents/ .public
+  - mv .public public
   artifacts:
     paths:
     - public