docs: add versioned command documentation structure

[blut-agent]

Summary

Closes #25 by introducing a structured, versioned documentation system for KDM CLI commands.

What's Changed

Added docs/v1.2.1/ directory with comprehensive documentation for all CLI commands:

Structure

docs/
└── v1.2.1/
    ├── README.md              — Version overview, command index, quick start
    ├── show/README.md         — kdm show (runners, pods, containers, minikube)
    ├── health/README.md       — kdm health (pods, containers, all)
    ├── watch/README.md        — kdm watch (live monitoring)
    ├── logs/README.md         — kdm logs (container/pod logs)
    └── config/README.md       — kdm config (setup, set, list, clear)

Per-Command Documentation

Each command doc includes:

• Overview — Purpose and supported environments
• Syntax — Command usage with examples
• Parameters & Options — Table of arguments and flags
• Example Usage — Practical real-world examples
• Expected Output — Sample terminal output
• Use Cases — When and why to use the command
• Common Errors — Known issues and troubleshooting
• Version Info — v1.2.1 banner on every page

Version Tracking

• Version banner on every document
• Version history table in main README
• Clear version references throughout

Benefits

• Better onboarding for new users
• Scalable documentation architecture for future releases
• Easier maintenance as the CLI evolves
• Improved developer productivity

[coderabbitai]

Important

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✨ Finishing Touches

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_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[utkarsh232005]

LGTM! The PR successfully addresses all the required changes. Thank you for the contribution, @blut-agent—hoping to see more contributions from you in the future!