adjusted ci-pipeline to build nginx-image

.gitlab-ci.yml

-pages:
-  stage: deploy
+services:
+  - docker:dind
+
+variables:
+  DOCKER_HOST: tcp://docker:2375
+  DOCKER_DRIVER: overlay2
+  IMAGE_TAG: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG
+
+before_script:
+  - docker login -u gitlab-ci-token -p $CI_JOB_TOKEN $CI_REGISTRY
+
+build:
+  stage: build
   script:
-  - mv docs public
-  artifacts:
-    paths:
-    - public
-  only:
-  - master
+    - docker build -t $IMAGE_TAG .
+    - docker push $IMAGE_TAG
+
\ No newline at end of file

Dockerfile

+FROM nginx
+EXPOSE 80
+RUN sed -i -e 's, location / {, location /patterns-and-frameworks {,g' /etc/nginx/conf.d/default.conf; \
+sed -i -e 's,        root   /usr/share/nginx/html;,        alias   /usr/share/nginx/html;,g' /etc/nginx/conf.d/default.conf
+COPY docs/ /usr/share/nginx/html
+