License of exercism icon / using it when linking to exercism

Hello,

I link to exercism on my website and would like to use the new icon for that, but I'm unsure about its license and under what conditions I may use it.

The logo itself is in [exercism/website](https://github.com/exercism/website/blob/master/app/assets/images/icon.png), which is published under AGPL-3.0. This is primarily a license for software/source code, and its conditions seem unusual for an icon, hence I'm asking here.

Is it allowed to use the icon on one's website when linking to exercism, what conditions need to be met and how to properly give credit?