adds a comment disabling svelte a11y checks for the overlay

[willgottschalk]

This closes #30. I read through https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Roles and didn't find a role that cleanly maps to an overlay. There's a dialog role:

window that separates content or UI from the rest of the web application or page

But the overlay is just a background and doesn't really have it's own content for screen readers

Instead of giving it an aria-role that doesn't match. I'd rather suppress the warning

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[willgottschalk]

The alternative is to add suppression checking in my codebase via https://stackoverflow.com/questions/77518443/disable-certain-a11y-warnings-globally-in-sveltekit

Happy to go either direction

[sharu725]

Thank you.