Resolve "Sentry.io blog detailing their integration with GitLab.com and GitLab SaaS"

Closes #3689 (closed)

i don't really know how to do all of this from a technical standpoint...i created the file but unsure how to add the 4 embedded images and the video mentioned in the issue. we can chat about it in the morning if needed @rebecca

https://gitlab.com/gitlab-com/www-gitlab-com/blob/3689-sentry-io-blog-detailing-their-integration-with-gitlab-com-and-gitlab-saas/2019-01-24-sentry-integration-blog-post.html.md.erb%20