Update to docusaurus 2

.gitignore

.gitlab-ci.yml

README.md

website/.gitignore

website/.gitlab-ci.yml

website/README.md

website/babel.config.js

website/blog/2016-03-11-blog-post.md

website/blog/2017-04-10-blog-post-two.md

website/blog/2017-09-25-testing-rss.md

website/blog/2017-09-26-adding-rss.md

website/blog/2017-10-24-new-version-1.0.0.md

website/blog/2019-05-28-hola.md

website/blog/2019-05-29-hello-world.md

website/blog/2019-05-30-welcome.md

website/core/Footer.js

website/docs/create-a-blog-post.md

website/docs/create-a-document.md

website/docs/create-a-page.md

website/docs/getting-started.md