Update command flag description in primary CLI documentation

[sudheer-quad]

This PR updates the inclusion and exclusion flag descriptions in the main CLI README.

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[gemini-code-assist]

Summary of Changes

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This pull request enhances the CLI documentation by updating the descriptions and providing usage examples for the --only and --skip flags. These flags enable users to target or exclude specific groups during deployment and destruction, offering more control over their deployments. The changes improve the user experience by clarifying the purpose and usage of these flags.

Highlights

• Flag Descriptions: Updated the descriptions for the --only and --skip flags in the main CLI README to provide more clarity.
• Selective Deployment Examples: Added examples demonstrating how to use the --only and --skip flags for selective deployment and destruction of groups.
• Documentation Enhancement: Included a reference to the Selective Deployment and Exclusion Guide for more detailed instructions.

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[gemini-code-assist]

Code Review

This pull request improves the CLI documentation by adding details about the --only and --skip flags to the main cmd/README.md. The changes are clear and centralize important information for users. I've left a couple of suggestions to improve the formatting consistency and clarity of the new documentation section.