ControlR server update documentation

[JoeSerity]

Trying to find documentation on best practices for ControlR server updates.

[bitbound]

@JoeSerity Docs are here: https://docs.controlr.app/docs/admin/upgrading

Basically, the steps are:

• Back up your DB.
  • If this is your first time doing a backup, I highly recommend doing a restore into a new separate DB and point ControlR at it to make sure it works.
• Read all the release notes between your current version and target version.
• Make sure there are no breaking changes that affect you or require manual changes.
• Diff the latest Docker compose file (which is an asset on the release) with yours and copy over any new settings that you're missing.
• Change the image tag to the new version.
• Then docker compose pull; docker compose up;