## Description
This PR moves all the existing template README images for the Coder
namespace from being defined inline to its `.images` directory. This
makes the image-processing logic in the Registry build step easier to
maintain.
## Type of Change
- [ ] New module
- [x] Bug fix
- [ ] Feature/enhancement
- [ ] Documentation
- [ ] Other
## Testing & Validation
- [x] Tests pass (`bun test`)
- [x] Code formatted (`bun run fmt`)
- [x] Changes tested locally
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## Related Issues
Related to https://github.com/coder/registry/issues/132
