README header causes rendering problems on the Microsoft Visual Studio Marketplace

Summary

See https://marketplace.visualstudio.com/items?itemName=GitLab.gitlab-workflow

---
stage: Create
group: Code Review
info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments
---

Possible fixes

remove the header introduced in !461 (merged)

/cc @aqualls