docs: fix images and add garnix badge

README.md

@@ -1,7 +1,8 @@
 [![Check and Build configuration](https://github.com/soopyc/nix-on-koumakan/actions/workflows/build.yaml/badge.svg?branch=main)](https://github.com/soopyc/nix-on-koumakan/actions/workflows/build.yaml)
+[![Garnix Build Status](https://img.shields.io/endpoint.svg?url=https%3A%2F%2Fgarnix.io%2Fapi%2Fbadges%2Fsoopyc%2Fnix-on-koumakan)](https://garnix.io)
 
 # Cow
-![a yak on some grass](docs/quaritsch-photography-1_6rJHQ2Gmw-unsplash.jpg)
+![a yak on some grass](docs/src/images/quaritsch-photography-1_6rJHQ2Gmw-unsplash.jpg)
 
 *Gracefully provided by [Quaritsch Photography](https://unsplash.com/@quaritsch) on Unsplash, via https://unsplash.com/photos/1_6rJHQ2Gmw*