Make audio/image pages without ids show a 404

[sarayourfriend]

Fixes

Fixes #496 by @obulat

Description

Adds an index.vue to the image and audio page directories so that we can render a 404 page when a single result route without an id is hit.

I'm not sure if this is really the right way to do this... I couldn't find any solid evidence about this and redirecting to /404 seems incorrect for some reason. If we prefer that though, we can do that instead of this. I do like that this is a little more on the "declarative" side of things rather than programatically testing the route.

Testing Instructions

Checkout the branch and run pnpm dev. Visit /image/ without an id and /audio/ without an id and verify that they show the 404 page.

Checklist

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• I added or updated tests for the changes I made (if applicable).
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[zackkrida]

I quite like this approach, as it also allows us to more easily make our error page support different error types, not just 404s. Something like:

 <VFourOhFour v-if="error.code === '404'" :error="error" />

[dhruvkb]

I like the name VFourOhFour. @panchovm what are your thoughts on i18n-ifying the "Oops" in the future?

[zackkrida]

My instinct would be to keep "Oops" as an sr-only decorative choice. I think it'd be really difficult to style with different string lengths.

[fcoveram]

Agree with @zackkrida. Besides, the design intends to be use across the WP site. Although I like the idea and worth raising it once people start redesigning other site sections.