Investigate why imports in mdx are not working

[emmenko]

MDX supports importing mdx and react components as react components:

https://mdxjs.com/getting-started#documents

Somehow it currently does not work in our setup.

Ref: #85

[emmenko]

I can confirm that this works out of the box. Example set up:

src/
  content/
    test.mdx
  topics/
    hello.mdx

In test.mdx, simply import

---
title: Test
---

This is a test page

import Hello from '../topics/hello'

<Hello />

Something else.

In hello.mdx

Hello, world!

The output is: