fix: remove unnecessary code in onboarding routes

[paul-boegelsack]

Summary

This PR removes switch cases of previously deleted routes

Changelog

- Cleans mobile app setup router
- Cleans mobile profile backup router
- Removes ledger import route and related code

Relevant Issues

Please list any related issues using development keywords.

...

Testing

Platforms

Please select any platforms where your changes have been tested.

• Desktop
  • MacOS
  • Linux
  • Windows
• Mobile
  • iOS
  • Android

Instructions

Please describe the specific instructions, configurations, and/or test cases necessary to test and verify that your changes work as intended.

...

Checklist

Please tick all of the following boxes that are relevant to your changes.

• I have followed the contribution guidelines for this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or modified tests that prove my changes work as intended
• I have verified that new and existing unit tests pass locally with my changes
• I have verified that my latest changes pass CI workflows for testing and linting
• I have made corresponding changes to the documentation