upload uninstall script and docs

This PR adds a comprehensive PowerShell script to uninstall Docker Community Edition from Windows systems, addressing the need for a clean removal process. ## What's Added ### `uninstall-docker-ce.ps1` Script A complete uninstall script that reverses the Docker CE installation by: - **Service Management**: Stops and removes the Docker service registration - **Binary Cleanup**: Removes `docker.exe` and `dockerd.exe` from System32 - **Data Management**: Cleans up Docker data directory and configuration files - **Optional Components**: - Preserves images, volumes, or networks ### Safety Features - Administrator privilege validation - Confirmation prompts for destructive operations - `-Force` parameter to skip confirmations for automation - `-Keep...` parameter to preserve images/volumes/networks (i.e. Docker data directory) - Comprehensive error handling with informative warnings ### Parameters ```powershell .\uninstall-docker-ce.ps1 [-Force] [-KeepImages] [-KeepVolumes] [-KeepNetworks] ``` ### Usage Examples ```powershell # Complete removal including images and networks .\uninstall-docker-ce.ps1 # Automated uninstall without prompts .\uninstall-docker-ce.ps1 -Force # Uninstall but keep Docker data .\uninstall-docker-ce.ps1 -KeepImages ``` ## Documentation Updates - Updated `Install-DockerCE/README.md` with complete documentation for the uninstall script ## Design Principles The script follows the same patterns and coding style as the existing `install-docker-ce.ps1`, ensuring consistency and maintainability. It includes proper error handling, user feedback, and follows PowerShell best practices. Fixes #545.