Improved code organization and maintainability:
- Created image_support_files/ directory for Docker helper scripts
- Moved bash-with-nvm and docker-entrypoint.sh to support directory
- Added comprehensive README.md documenting each script's purpose
- Updated Dockerfile to COPY from organized directory structure
Benefits:
- Cleaner repository structure
- Scripts are now version-controlled files (not echo chains)
- Easier to read, modify, and maintain
- Self-documented with in-directory README
No functional changes - all nvm functionality remains identical.
