- Move custom-rules.md, custom-instructions.md from advanced-usage/ to customization/
- Move custom-modes.md, settings-management.md, skills.md from features/ to customization/
- Move workflows.mdx from features/slash-commands/ to customization/
- Update sidebar configuration to place Customization section before Advanced Usage
- Update all internal documentation links to reflect new paths
- Remove nested 'Customizing Kilo Code' subsection from Advanced Usage
This reorganization makes customization options more discoverable by placing
them at the top level rather than nested under advanced usage.