chore: fix source references and cleanup readme (#593)

## Description

Update source references in README to
`registry.coder.com/harleylrn/kiro-cli/coder` from
`registry.coder.com/coder/kiro-cli/coder`

Remove verbose tf docs from README since it is visualized in the
registry.

<!-- Briefly describe what this PR does and why -->

## Type of Change

- [ ] New module
- [ ] New template
- [ ] Bug fix
- [ ] Feature/enhancement
- [X] Documentation
- [ ] Other

## Module Information

<!-- Delete this section if not applicable -->

**Path:** `registry/harleylrn/modules/kiro-cli`  
**New version:** `v1.0.1`  
**Breaking change:** [ ] Yes [X] No

## Testing & Validation

- [X] Tests pass (`bun test`)
- [X] Code formatted (`bun fmt`)
- [X] Changes tested locally

Author: DevelopmentCats