docs: add workspace hierarchy documentation

[roderik]

Summary

• Added comprehensive documentation for the Workspace Hierarchy feature
• Positioned as an enterprise multi-tenant management capability
• Included detailed information about parent-child workspace structures, resource sharing, centralized billing, and best practices

Changes

• Created new documentation file: content/docs/platform-components/account-billing/workspace-hierarchy.mdx
• Updated navigation in content/docs/platform-components/account-billing/meta.json to include the new page

Documentation Coverage

The documentation covers:

• Parent-Child Workspace Structure
• Hierarchical Organization benefits
• Resource Sharing across workspaces
• Centralized Billing for parent workspaces
• Step-by-step setup instructions
• Permission inheritance model
• Best practices for enterprise multi-tenant management
• Example workspace structures for different use cases
• Troubleshooting common issues

This feature is highlighted as a key enterprise capability for organizations with complex structures requiring sophisticated multi-tenant management.

Summary by Sourcery

Add comprehensive Workspace Hierarchy documentation as an enterprise multi-tenant management feature in the account-billing section

Documentation:

• Add new Workspace Hierarchy documentation page covering parent-child structures, resource sharing, centralized billing, permission inheritance, setup instructions, best practices, examples, and troubleshooting
• Update account-billing navigation meta to include the Workspace Hierarchy page

[sourcery-ai]

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