Refactor the Gemnasium import docs
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![doc/user/project/import/img/gemnasium/connect_github.png](https://lab.node.vifib.com/nexedi/gitlab-ce/-/raw/12d57caf99de6c992c19d7bf3e029ffc8bcc2994/doc/user/project/import/img/gemnasium/connect_github.png)
![doc/user/project/import/img/gemnasium/create_project.png](https://lab.node.vifib.com/nexedi/gitlab-ce/-/raw/12d57caf99de6c992c19d7bf3e029ffc8bcc2994/doc/user/project/import/img/gemnasium/create_project.png)
![doc/user/project/import/img/gemnasium/edit_gitlab-ci.png](https://lab.node.vifib.com/nexedi/gitlab-ce/-/raw/12d57caf99de6c992c19d7bf3e029ffc8bcc2994/doc/user/project/import/img/gemnasium/edit_gitlab-ci.png)
![doc/user/project/import/img/gemnasium/pipeline.png](https://lab.node.vifib.com/nexedi/gitlab-ce/-/raw/12d57caf99de6c992c19d7bf3e029ffc8bcc2994/doc/user/project/import/img/gemnasium/pipeline.png)
![doc/user/project/import/img/gemnasium/project_connected.png](https://lab.node.vifib.com/nexedi/gitlab-ce/-/raw/12d57caf99de6c992c19d7bf3e029ffc8bcc2994/doc/user/project/import/img/gemnasium/project_connected.png)
![doc/user/project/import/img/gemnasium/report.png](https://lab.node.vifib.com/nexedi/gitlab-ce/-/raw/12d57caf99de6c992c19d7bf3e029ffc8bcc2994/doc/user/project/import/img/gemnasium/report.png)
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