Some images are not properly loaded in production mode

[AugustinLF]

I observed that some ressources are not properly loaded (happens also on my own fork of the boilerplate). In dev mode (when running yarn start it works perfectly.

How to reproduce:

$ git clone ...
$ yarn install
$ yarn build
open index.html go slide 8

You'll see that some logo just don't appear. If I'm not mistaking, the npm logo should appear on the right of SendGrid's one.

I use:

• node v8.3.0 (it also happened on a 7.X version)
• yarn v0.23.2
• Chrome 60.0.3112.90
• macOS 10.12.6 (Sierra), MacBook Prop (Early 2015)

I don't think I have anything really specific about my machine, or my configuration.