Add Git-managed dashboards workflow

[mintlify]

Summary

• Adds a new Git-managed dashboards section to the dashboards as code page, describing a workflow where Git is the single source of truth and the UI is read-only for managed content
• Adds a comparison table at the top of the page contrasting disposable editing vs. Git-managed dashboards (source of truth, UI editing, version history, review process, setup complexity, best-for scenarios)
• Restructures the page to present both workflows under a new "Choosing a workflow" intro section
• Kept high-level with no code examples as requested — covers when to use, locking down the UI with space permissions, the change workflow, and CI/CD setup guidance

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Project	Status	Preview	Updated (UTC)
lightdash	🟢 Ready	View Preview	Apr 1, 2026, 4:31 PM

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