maintain the original non-modes based baseline

[winkerVSbecks]

over the last few weeks, we’ve had at least a couple customers who are using modes but want to maintain the original (non-modes-based) baselines. Internally, this is easily achievable simply by naming one of your modes ‘1200px’, but we do not mention that anywhere in our doc.

This new section explains how to maintain baseline while testing with modes

[github-actions]

🚀 Deployed on https://deploy-preview-maintain-non-modes-baseline-314632c--chromatic-docs.netlify.app

[andrewortwein]

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