I have some images in one of the .md I'm using in my Docma documentation:

![test](img/foo.png)

That's get transformed as:

<img src="img/foo.png" alt="test" />

But the img/foo.png is not copied to the output folder so when reading the documentation I don't see the image.

Is there a way to specify an assets directory that will be added to the generated documentation? Or should I do it by hand?