Enhance logo display with picture element

Updated logo display to support dark and light themes.

Author: driesvints

README.md

@@ -1,5 +1,9 @@
 <p align="center">
-    <img src="https://github.com/laravelio/art/blob/main/laravelio-logo-lg.svg" width="400" />
+    <picture>
+        <source media="(prefers-color-scheme: dark)" srcset="https://github.com/laravelio/art/blob/main/laravelio-logo-lg-white.svg">
+        <source media="(prefers-color-scheme: light)" srcset="https://github.com/laravelio/art/blob/main/laravelio-logo-lg.svg">
+        <img alt="Laravel.io logo" src="https://github.com/laravelio/art/blob/main/laravelio-logo-lg.svg" width="400">
+    </picture>
 </p>
 
 <p align="center">