🔧 Simplify secrets set to use single --repo flag

[dsyme]

Summary

• Replace separate --owner and --repo flags with a single --repo owner/repo flag for gh aw secrets set
• Default to the current repository when --repo is not specified
• Update documentation and usage examples to reflect the new flag interface

[Copilot]

Pull request overview

This pull request simplifies the gh aw secrets set command by replacing separate --owner and --repo flags with a single --repo owner/repo flag, improving usability and consistency with other commands in the codebase.

Changes:

• Replaced --owner and --repo flags with a single --repo flag that accepts owner/repo format
• Updated command to default to the current repository when --repo is not specified
• Refactored repository determination logic to use the standardized addRepoFlag() helper

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
pkg/cli/secret_set_command.go	Replaced dual flag variables with addRepoFlag() call, simplified repository determination logic to handle single --repo flag with owner/repo format
docs/src/content/docs/setup/cli.md	Updated documentation examples and options to reflect the new single --repo flag interface

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