Merge branch 'add-deploy-job' into 'master'

Add CI deploy job.

See merge request !1

.gitlab-ci.yml

+variables:
+  DEPLOY_ROOT: "/var/www/html/hcc-docs"
+
+stages:
+  - deploy
+
+deploy:
+  stage: deploy
+  environment:
+    name:  hcc_docs_prod
+    url:  http://10.71.110.145/hcc-docs
+  only:
+    - master
+  tags:
+    - hcc-docs-test
+  script:
+    - hugo -v
+    - rsync -avz --delete public/ $DEPLOY_ROOT