Sunshine: Refactor config page (add search and sections)

### Is there an existing issue for this item?

- [x] I have searched the existing issues

### Repositories

LizardByte/Sunshine

### Languages/Skills/Technologies

Vue, JavaScript, HTML, CSS

### Description

Make it easier to find specific options in the config UI.

### Estimated Effort

effort:Large

### Priority

priority:Medium

### Target Milestone

6+ months

### Dependencies

_No response_