feat: add GitLab case study

Anatoly Stanslerrequested to merge
gitlab-use-case into master

Description

This MR adds GitLab's case study to the resources page.

Related issue

Examples

Screenshot_2021-06-18_at_01.01.27

Checklist

  • the MR description has been reviewed
  • this MR contains text changes and they have been reviewed OR there are no texts changes
  • this MR contains GUI/CLI changes and they have been reviewed OR there are no GUI/CLI changes
  • this MR contains API changes and they have been reviewed OR there are no API changes
Edited by Anatoly Stansler

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