Build data fetching wrapper for Article Card component

Whenever an editor wants to use a "card component" somewhere to preview/link to another post/article, we need to offer a simpler wrapper for this. The editor should have to manually set image, description, target, etc. All this should be fetched from the frontmatter/mdx of the given post/article inside the filesystem.

I propse that the editor should only pass the slug, and all the other content should be fetched automatically, e.g. usage should look something like this:

<ArticleCard slug="/blog/my-first-post" />

All the content should then be fetched and populated automatically during compile time.