add ci config with deploy to test location

.gitlab-ci.yml

+before_script:
+  - nikola build
+
+test_deploy:
+  script:
+    - mkdir -p ~/.ssh && ssh-keyscan kwant-project.org >> ~/.ssh/known_hosts
+    - echo $TEST_WEBSITE_KEY > deploy_key && sed -i 's/\r /\n/g' deploy_key && chmod 600 deploy_key
+    - nikola deploy
+  allow_failure: true