adds accessibility statement to app footer

[MelSumner]

📌 Summary

Adds an accessibility statement to the application footer.

📸 Screenshots

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👉 Review by files changed

Reviewer's checklist:

• +1 Percy if applicable
• Confirm that PR has a changelog update via Changesets if needed

💬 Please consider using conventional comments when reviewing this PR.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 827b7e4

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[vercel]

This pull request is being automatically deployed with Vercel (learn more).
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hds-flight-website – ./

🔍 Inspect: https://vercel.com/hashicorp/hds-flight-website/D9AWSTe3KbHTten8Mmyh7oKmaT1J
✅ Preview: https://hds-flight-website-git-melsumner-a11y-statement-hashicorp.vercel.app

hds-components – ./

🔍 Inspect: https://vercel.com/hashicorp/hds-components/Dvkfg3XWekKVHyaTtZoE8ozAcu7Y
✅ Preview: https://hds-components-git-melsumner-a11y-statement-hashicorp.vercel.app

[amyrlam]

Left a few non-blocking suggestions. Since there are some issues on Cristiano's review, waiting til they're addressed before leaving a review

Another non-blocking suggestion: Would be cool to have a link for "WCAG 2.1 AA standards", or briefly explain what it is, as some folks might not know what it is