Styling differences in self-contained docs vs. docs.gitlab.com

I noticed that NOTE: tags aren't styled when rendered inside GitLab:

• https://gitlab.com/help/user/project/container_registry#enable-the-container-registry-for-your-project

  

• https://docs.gitlab.com/ee/user/project/container_registry.html#enable-the-container-registry-for-your-project

  

There are other subtle differences, and the docs.gitlab.com version also has the benefit of having the full navigation on the left and the page navigation on the right. I wonder if it might be worth investigating if we could just host the full docs app inside GitLab?

/cc @marcel.amirault @axil