Accessibility: Fix sequential heading order

What does this MR do and why?

Fixes sequential heading order on the homepage and in the footer (spotted during the accessibility QA task: #426 (closed)).

https://dequeuniversity.com/rules/axe/4.8/heading-order

Screenshots, screen recordings, or links to review app

No visual changes.

Before After
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How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

  1. Configure a local GitLab Docs environment.
  2. Check out this branch.
  3. Verify the footer and homepage cards look the same as the do on the redesign-2025 branch: https://docs.gitlab.com/review-mr-828/

Merge request acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

Edited by Sarah German

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