Add .gitlab-ci.yml to publish static website

This simply "pushes" all files in the repository to a website.

.gitlab-ci.yml

@@ -0,0 +1,12 @@
+image: alpine:latest
+
+pages:
+  stage: deploy
+  script:
+  - mkdir public
+  - mv * public/
+  artifacts:
+    paths:
+    - public
+  only:
+  - master