broken image in the quickstart

[CarloLucibello]

In the quickstart, After "Here's the loss during training:" the image is not displayed.

I don't know what is wrong with this line

Flux.jl/docs/src/guide/models/quickstart.md

Line 65 in 0a324f8

<img align="right" width="300px" src="../../assets/quickstart/loss.png">

[mcabbott]

Presumably broken by moving things in #2422 ? The relative path no longer points to the same place.