chore(readme): Use dark theme supported markup for star history

README.md

@@ -29,4 +29,11 @@ A familiar(ish) Ubuntu desktop for Fedora Silverblue. It strives to cover these
 
 ## Star History
 
-[![Star History Chart](https://api.star-history.com/svg?repos=ublue-os/bluefin&type=Date)](https://star-history.com/#ublue-os/bluefin&Date)
+<a href="https://star-history.com/#ublue-os/bluefin&Date">
+  <picture>
+    <source media="(prefers-color-scheme: dark)" srcset="https://api.star-history.com/svg?repos=ublue-os/bluefin&type=Date&theme=dark" />
+    <source media="(prefers-color-scheme: light)" srcset="https://api.star-history.com/svg?repos=ublue-os/bluefin&type=Date" />
+    <img alt="Star History Chart" src="https://api.star-history.com/svg?repos=ublue-os/bluefin&type=Date" />
+  </picture>
+</a>
+