feat(elastic-metal): add page for rescue data for EM in rescue mode and troubleshoot ssh issues

Author: Jonathan-alter

pages/elastic-metal/troubleshooting/troubleshoot-ssh-issues.mdx

@@ -29,6 +29,7 @@ You are unable to connect to your Scaleway Elastic Metal server via SSH.
 - Incorrect SSH credentials or key configuration.
 - The server is in rescue mode and requires a different login method.
 - A recent security policy change has disabled SSH access.
+- You recently change your SSH keys and it hasn't be added to Elastic Metal system
 
 ## Solution
 
@@ -54,4 +55,9 @@ You are unable to connect to your Scaleway Elastic Metal server via SSH.
 #### Verify the SSH service status
 - Use the remote console from the Scaleway dashboard to access your server.
 - Run `systemctl status ssh` to check if the SSH service is running.
-- If the service is stopped, restart it using `systemctl restart ssh`.
+- If the service is stopped, restart it using `systemctl restart ssh`.
+
+#### Add the new SSH key to the existent system
+- Reboot in rescue mode as explain in this [documentation](/elastic-metal/how-to/use-rescue-mode/)
+- Mount filesystem in rescue mode to access data and files by folowing these [steps](/elastic-metal/troubleshooting/troubleshoot-rescue-your-data/##mounting-partitions)
+- Modify the "authorized_keys" file to add your new SSH public key at the end