chore: replace logo with updated version

Renamed awn-logo.png to logo.png and updated README reference.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: Tom-De-Santa-FOSS

README.md

@@ -1,5 +1,5 @@
 <p align="center">
-  <img src="awn-logo.png" alt="awn logo" width="200" />
+  <img src="logo.png" alt="awn logo" width="200" />
 </p>
 
 # awn