[WIP] Fix accessibility issue with page content landmarks

[Copilot]

Thanks for assigning this issue to me. I'm starting to work on it and will keep this PR's description up to date as I form a plan and make progress.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Accessibility issue: All page content should be contained by landmarks on /presentations/a11y-sovereignty-fosdem26.html</issue_title>
<issue_description>## What
An accessibility scan flagged the element <div class="clock" aria-label="clock"> on https://ox.ca/presentations/a11y-sovereignty-fosdem26.html because all page content should be contained by landmarks. Learn more about why this was flagged by visiting https://dequeuniversity.com/rules/axe/4.11/region?application=playwright.

To fix this, ensure all page content is contained by landmarks.

Specifically:

Fix any of the following:

• Some page content is not contained by landmarks

Acceptance Criteria

• The specific axe violation reported in this issue is no longer reproducible.
• The fix MUST meet WCAG 2.1 guidelines OR the accessibility standards specified by the repository or organization.
• A test SHOULD be added to ensure this specific axe violation does not regress.
• This PR MUST NOT introduce any new accessibility issues or regressions.

</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Accessibility issue: All page content should be contained by landmarks on /presentations/a11y-sovereignty-fosdem26.html #17

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