Fix broken Warp banner image URL in README

- Replace broken brand-assets URL with working GitHub assets URL
- Fixes image placeholder issue where Warp banner wasn't displaying

Author: danielmiessler

README.md

@@ -1,6 +1,6 @@
 <p align="center">
   <a href="http://go.warp.dev/seclists" target="_blank">
-    <img src="https://raw.githubusercontent.com/warpdotdev/brand-assets/main/Github/Sponsor/warp-banner-light.png" alt="Warp - built for coding with multiple AI agents" width="600"/>
+    <img src="https://github.com/user-attachments/assets/96ab3d81-9b13-4df4-ba09-75dee7a5c3d2" alt="Warp - built for coding with multiple AI agents" width="600"/>
   </a>
 </p>