Rename glfm_markdown entrypoint to gitlab-glfm-markdown and publish 0.0.39

Asherah Connorrequested to merge
push-mvttksxluzpm into main

What does this MR do and why?

  • Rename glfm_markdown entrypoint to gitlab-glfm-markdown, to match the gem name
  • Publish 0.0.39

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