Add more details for prefix and projects (OVH)

Author: jtpio

doc/zero-to-binderhub/ovh/new_project.png

@@ -217,6 +217,19 @@ where:
 
 * `<hash>` is the hash of the registry
 * `<region>` is the region of the registry
+* `<prefix>` corresponds to the image prefix. If you created a new project called ``myproject`` in the previous section,
+  then ``<prefix>`` should start with ``myproject/``
+
+As an example, the config should look like the following::
+
+    config:
+      BinderHub:
+        use_registry: true
+        image_prefix: abcde.gra7.container-registry.ovh.net/myproject/binder-
+      DockerRegistry:
+        url: https://abcde.gra7.container-registry.ovh.net
+        token_url: https://abcde.gra7.container-registry.ovh.net/service/token?service=harbor-registry
+
 
 If you are using a custom registry
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

doc/zero-to-binderhub/setup-binderhub.rst

@@ -157,6 +157,14 @@ To use the OVH Container Registry, log in to the `OVH Control Panel <https://www
 
 5. Then click on **Harbor API** to retrieve the URL of the registry
 
+6. Log in to the Harbor Interface using the identification details, and create a new project:
+
+.. figure:: ovh/new_project.png
+
+  Create a new Harbor project.
+
+7. The name of the project will be used when setting up the registry config in the next section
+
 For more information about these steps, check out the `OVH Documentation <https://docs.ovh.com/gb/en/private-registry/creating-a-private-registry>`_
 
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