Add a favicon to the docs?

For bookmarks, and easier tab recognizability, I'd like to have a favicon.

https://www.arangodb.com/ has this code...

<link rel="shortcut icon" href="https://www.arangodb.com/wp-content/uploads/2018/07/www.arangodb.com-favicon.png">

...which could maybe be repurposed? (I'm not sure if arangojs is connected closely enough to legally use the same logo or code.)

Even if you can't use the same icon, I'd still be happy with another icon.

The docs are generated via Jekyll using GitHub pages. I haven't found a way to use favicons with those. If you can find something that works, feel free to create a PR to the gh-pages branch.