docs: use Constructive outline logo, drop Supabase-derived logo

Author: pyramation

README.md

@@ -1,7 +1,7 @@
 # PGlite Test Suite
 
 <p align="center" width="100%">
-  <img height="250" src="docs/img/logos.svg" />
+  <img height="250" src="https://raw.githubusercontent.com/constructive-io/constructive/refs/heads/main/assets/outline-logo.svg" />
 </p>
 
 <p align="center" width="100%">