Fix 404 "Head back to the homepage" link to always resolve to root

[Copilot]

The "Head back to the homepage" link in 404.html used {{ site.baseurl }} which, when empty, renders as href="" — a relative URL that resolves to the current path (e.g. /page/2/) instead of the site root.

Change

• 404.html: Replace {{ site.baseurl }} with / so the link always resolves to the root domain regardless of where the 404 is served from.

- <a href="{{ site.baseurl }}">Head back to the homepage</a>
+ <a href="/">Head back to the homepage</a>

Original prompt

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This section details on the original issue you should resolve

<issue_title>Fix the head back to the homepage link</issue_title>
<issue_description>"Uh oh. Something doesn't seem right here! Head back to the homepage."

Fix the link so this links to the route domain. </issue_description>

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

• Fixes Fix the head back to the homepage link #9

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