Orbic USB installer is becoming harder to maintain

### Prerequisites

- [x] I have read [CONTRIBUTING.md](https://github.com/EFForg/rayhunter/blob/main/CONTRIBUTING.md)

### Rayhunter Version

v0.10.1

### Device

Orbic RC400L

### Installer OS

Linux

### Describe the Issue

as we've developed and unified our installer framework under the `DeviceConnection` trait, our legacy USB installer for the Orbic has become more and more of an outlier that's hard to update. i think we can deal with this in one of two ways:

1. unify the USB installer under the `DeviceConnection` trait somehow
2. deprecate it

since our docs currently recommend users away from using it, i'd vote for option 2. that said, if we do deprecate it, i think we ought to replicate the rooting process in some other form (either as a rust binary, or maybe just a python script) that copies over the rootshell, since that's still an invaluable way to debug issues on the orbic.