remove submodule and added gitlab pipeline

.gitlab-ci.yml

@@ -0,0 +1,17 @@
+image: python:3.9:latest
+
+before_script:
+  - time apt update
+  - time pip install -r requirements.txt
+  - time cd mkdocs-ivory && python setup.py install && cd ..
+
+pages:
+  stage: deploy
+  script:
+    - time mkdocs build --site-dir public
+  artifacts:
+    paths:
+      - public
+  rules:
+    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
+