docs(getting-started): provide optional global styles

[danielleroux]

🆕 What is the new behavior?

Documentation for siemens/ix#2632

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[gemini-code-assist]

Code Review

This pull request updates the production environment configuration to target the main branch. It also updates the developer usage documentation for theming to explain how to apply only foundation styles without global utilities, detailing how to import legacy utilities explicitly if needed. There are no review comments, so I have no feedback to provide.

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