docs(cli): game-ci CLI documentation

[frostebite]

Summary

Adds documentation pages for the new game-ci CLI under the GitHub Orchestrator section:

• Getting Started — installation (npm install -g game-ci / npx), license activation, first build walkthrough, environment variables
• Build Command — full flag reference including project options, versioning, Android-specific flags, Docker container options, IL2CPP, and output structure
• Orchestrate Command — provider selection (AWS, Kubernetes, local-docker), provider-specific options, cache/storage configuration, workspace options, git authentication, configuration override, and resource management
• Other Commands — activate (license management), cache list|restore|clear (cache management), status (environment diagnostics), version, and global flags

Related: game-ci/unity-builder#812, game-ci/unity-builder#813

Pages

File	Description
docs/03-github-orchestrator/08-cli/_category_.yaml	Sidebar category (position 8, "CLI")
docs/03-github-orchestrator/08-cli/01-getting-started.mdx	Quick start guide
docs/03-github-orchestrator/08-cli/02-build-command.mdx	Build command reference
docs/03-github-orchestrator/08-cli/03-orchestrate-command.mdx	Orchestrate command reference
docs/03-github-orchestrator/08-cli/04-other-commands.mdx	activate, cache, status, version

Test plan

• Verify pages render correctly in Docusaurus local dev (npm start)
• Verify sidebar navigation shows "CLI" section at position 8
• Verify internal cross-links between CLI pages resolve
• Verify links to existing pages (API Reference, Providers, Advanced Topics) resolve

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[github-actions]

[frostebite]

Consolidated into #541 (docs: LTS 2.0.0 — Combined Documentation). Updated for standalone @game-ci/orchestrator architecture.