Clean the CI conf.

.gitlab-ci.yml

 stages:
 - deploy
 
+# Deployment is done in a reverse manner.
+# Instead of rsyncing the files on the servers, we notify them.
+# They will `git pull` the master by themselves.
 deploy:
   stage: deploy
   image: appropriate/curl:latest
-#  image: byrnedo/alpine-curl:0.1
-# > curl: host sh not found
-#   before_script:
-  # Host not found. But the runner has internet access?!
-#   - curl "https://courses.m3p2.ljbac.com/sync"
   script:
-  - echo "Sending hooks to the production servers…"
-  - curl "https://courses.m3p2.ljbac.com/sync"
+  - echo "Sending hook(s) to the production server(s)…"
+  - curl --no-buffer --silent --show-error https://courses.m3p2.ljbac.com/sync
   - echo "Deployed!"
 
 # Ideally we should test all the pages of the website