Implement Schema.org Webpage microdata

• For https://gitlab.com/gitlab-com/gitlab-docs/issues/195

Resolves:

• Structured metadata: restructure to have 1 org (home), 1 website (home), multiple webpages (all of them)

How it looks

• Homepage (docs.gitlab.com):

  

• EE landing page:

  

• Regular doc (GitLab CI/CD):

  

https://search.google.com/structured-data/testing-tool