feat(messaging): add cli commands to troubleshooting

Author: jlecomte

pages/nats/troubleshooting/cant-delete-namespace.mdx

@@ -27,4 +27,10 @@ Try the following steps:
 
 1. In the Scaleway console, check that you have no remaining resources in either of the [NATS](https://console.scaleway.com/nats/), [Queues](https://console.scaleway.com/queues/), or [Topics and Events](https://console.scaleway.com/topics-events/) sections. **Make sure to check for resources in all regions by using the regional drop-down menu.**
 
-2. If you have deleted all resources for these three products and the problem persists, [open a support ticket](https://console.scaleway.com/support/tickets/create) to request manual deletion of the phantom namespace.
+2. If you have deleted all resources for these three products and you still can't delete the project, try using those [CLI](https://www.scaleway.com/en/docs/scaleway-cli/quickstart/) commands:
+```
+scw mnq sqs deactivate project-id=<your_project_id>
+scw mnq sns deactivate project-id=<your-project_id>
+```
+
+3. If you have tried all these solutions and the problem persists, [open a support ticket](https://console.scaleway.com/support/tickets/create) to request manual deletion of the phantom namespace.