Host docs on gitlab pages

.gitlab-ci.yml

+test-pages:
+  tags: [docker]
+  image: alpine
+  except:
+    - master
+  before_script:
+    - apk update
+    - apk add doxygen git texlive-full py3-jinja2 py3-pygments
+    - git clone git://github.com/mosra/m.css
+  script:
+    - ./m.css/documentation/doxygen.py Doxyfile-mcss
+    - mv generated-docs/html/ public/
+  artifacts:
+    paths:
+      - public
+  
+pages:
+  tags: [docker]
+  image: alpine
+  only:
+    - master
+  before_script:
+    - apk update
+    - apk add doxygen git texlive-full py3-jinja2 py3-pygments
+    - git clone git://github.com/mosra/m.css
+  script:
+    - ./m.css/documentation/doxygen.py Doxyfile-mcss
+    - mv generated-docs/html/ public/
+  artifacts:
+    paths:
+      - public