Docs: new index - project's settings
What
New index for project's settings.
Why
There is no doc for repository settings. Create one in doc/user/project/settings/index.md
Follow up from https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/12609
New index for project's settings.
There is no doc for repository settings. Create one in doc/user/project/settings/index.md
Follow up from https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/12609