images: use hanken grotesk in banners

images/README.md

@@ -1,6 +1,9 @@
 # Images
 
-This holds any images on the main README, and the base files for the icons and banner. The font used, like Jellyfin, is [Quicksand](https://fonts.google.com/specimen/Quicksand) by Andrew Paglinawan.
+This holds any images on the main README, and the base files for the icons and banner. The font used pre-0.5.0, like Jellyfin, is [Quicksand](https://fonts.google.com/specimen/Quicksand) by Andrew Paglinawan. These old versions are prefixed with `-quicksand` in `src/`.
+
+Post-0.5.0, the font used is Hanken Grotesk, available under SIL OFL 1.1 License.
+https://scripts.sil.org/cms/scripts/page.php?item_id=OFL_web
 
 "Go" text logo and Gopher image: Copyright 2018 The Go Authors. All rights reserved.
 https://creativecommons.org/licenses/by/3.0/legalcode