[4915] Accessibility: Global header & footer fixes

[n-lark]

Description

See #4915 (comment)

Related Issue(s)

Resolves #4915

Checklist

• I have read the contribution guidelines
• I have considered the performance impact of these changes
• Suitable unit/system level tests have been added and they pass
• Documentation has been updated
• For blog PRs, an Art Request has been created (instructions)

[netlify]

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Lighthouse	1 paths audited Performance: 82 (🔴 down 3 from production) Accessibility: 90 (🟢 up 4 from production) Best Practices: 92 (no change from production) SEO: 91 (no change from production) PWA: - View the detailed breakdown and full score reports

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