Update status section in adr-005-box-sx.md

[lesliecdubs]

Closes #7184

Changelog

Changed

Marks ADR "Use Box as a building block for all other components" as superseded, because we now style using CSS Modules and not the Box components

Rollout strategy

• Patch release
• Minor release
• Major release; if selected, include a written rollout or migration plan
• None; if selected, include a brief description as to why

Testing & Reviewing

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Pull Request Overview

This PR updates the status section of the Box/sx ADR to mark it as superseded by the CSS ADR. The change reflects the project's migration from using Box components with sx props to CSS Modules for styling components.

Key changes:

• Replaces the approval/adoption status table with a new format indicating the ADR is superseded
• Links to the CSS ADR (adr-016-css.md) as the superseding document