Move docs in `project_services/` to `user/project/services/`
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Move project_services/
touser/project/services/
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Move project_services/project_services.md
touser/project/services.md
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Move services_templates
touser/admin_area/services_templates
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Submit MR to EE
Needed for https://gitlab.com/gitlab-org/gitlab-ce/issues/21742