Added autobuild CI

.gitlab-ci.yml

+stages:
+ - build
+
+build:lektor:
+ stage: build
+ image:
+ name: nikolaik/python-nodejs
+ entrypoint: /bin/bash
+ before_script:
+ - pipenv install
+ script:
+ - pipenv run lektor build -f webpack -O www
+ artifacts:
+ paths:
+ - www