Smoother Onboarding for Existing NR Instances

### Description

Epic to capture thoughts and ideas around how we can smoothen the transition from an existing Node-RED instance to that being managed through FlowFuse.

Supplementary to the new Freemium Offering, we're look to provide a free, easy to use tool to manage multiple Node-RED instances that are _not_ hosted within the same environment as FlowFuse, i.e. "Edge Instances/Devices".

Given that there are millions of active Node-RED instances out there already too, how can we provide FlowFuse's benefits/value to those?

### Which customers would this be available to

None