Onboarding: FlowFuse Self-Hosted

### Description

May be some overlap with #3839

This Epic is to capture hurdles and areas for improvement for the onboarding process for FlowFuse Self-Hosted.

### Review

As part of this exercise, we will be conducting reviews of the full installation and setup of FlowFuse in self-hosted environments.

For each scenario it is important to have a blank slate, install FlowFuse and setup FlowFuse with the relevant settings such that it is possible to run an instance of Node-RED in FlowFuse.

```[tasklist]
### Scenarios
- [ ] https://github.com/FlowFuse/flowfuse/issues/4571
- [ ] https://github.com/FlowFuse/flowfuse/issues/4573
- [ ] https://github.com/FlowFuse/flowfuse/issues/4555
```

Any friction, concerns and areas for improvement should then be documented in the following tasks lists which are broken into two sections:

### Installation

The process of retrieving a copy of FlowFuse and running in a particular environment. Ideally, this would be a single line install in some capacity. This can also cover improvements for onboarding resources like documentation/videos.

```[tasklist]
### Installation
- [ ] https://github.com/FlowFuse/flowfuse/issues/4570
- [ ] https://github.com/FlowFuse/flowfuse/issues/4574
- [ ] https://github.com/FlowFuse/flowfuse/issues/4572
- [ ] https://github.com/FlowFuse/customer/issues/249
- [ ] Remove "flowforge" mentions from our installation docs
- [ ] https://github.com/FlowFuse/flowfuse/issues/4631
- [ ] https://github.com/FlowFuse/flowfuse/issues/4632
- [ ] https://github.com/FlowFuse/flowfuse/issues/4633
- [ ] https://github.com/FlowFuse/flowfuse/issues/4634
- [ ] https://github.com/FlowFuse/flowfuse/issues/4635
- [ ] https://github.com/FlowFuse/flowfuse/issues/4636
```

### Setup & Configuration

Having an available instance of FlowFuse, this is a review/assessment of the setup steps required to then having a running instance of Node-RED.

```[tasklist]
### Setup & Configuration
- [ ] https://github.com/FlowFuse/flowfuse/issues/4638
- [ ] Idea: for quick-start purposes allow to run pre-configured app and present login page instead of setup
```

### Which customers would this be available to

Self-Hosted