Add CI config

.gitlab-ci.yml

+image: node:10
+
+before_script:
+  - apt --yes update
+  - apt --yes install --no-install-recommends openssh-client
+
+  - npm install gitbook-cli -g
+
+  # Run ssh-agent (inside the build environment).
+  - eval $(ssh-agent -s)
+
+  # Add the SSH key stored in SSH_PRIVATE_KEY variable to the agent store.
+  - ssh-add <(echo "$SSH_PRIVATE_KEY")
+
+  # Add the SSH keys of remote Git servers, to disable host key checking questions.
+  - mkdir -p ~/.ssh
+  - ssh-keyscan -t rsa dev.validata.fr >> ~/.ssh/known_hosts
+
+job:
+  stage: build
+  script:
+    - gitbook build
+    - scp -r _book validata@dev.validata.fr:validata-doc-html
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