Fix duplicate search analytics event captures

[ben-fornefeld]

This pr adds the following:

1. prevents unnecessary analytics event captures when user erases query & user navigates through results with arrow keys
2. changes docs page legacy banner prose (v.1.0 -> v1.0)

[linear]

E2B-1434 fix docs search analytics

[changeset-bot]

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Latest commit: 8992302

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