Update remote-management.mdx

[adegoodyer]

Updated instructions to create systemd service for linux.

• use sensible log location
• add [install] section so service can be enabled
• add systemctl commands to enable and start service
• add system log command to debug any potential issues

Summary

Screenshots (optional)

Documentation checklist

• [ ] The documentation style guide has been adhered to.
• [ ] If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• [ ] Files which have changed name or location have been allocated redirects.