Revert "Tighten webpack rule merge rules to prevent clashes (#376)"

[askoufis]

Revert #376. This was causing issues with our internal usage of playroom. We rely on overriding playroom's .css file loading, but making the webpack merge rules stricter has made it impractical to override this rule (it required explicitly targeting codemirror within playroom's node modules). See #376 (comment) for further discussion.

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