Update README.md

Change the logo to black on transparent background.

Author: cewood

profile/README.md

@@ -1,4 +1,4 @@
-[![shipyard-logo](https://github.com/user-attachments/assets/1c0b1f77-ead6-4d77-bbef-b07aa0bcc71a)](https://ipshipyard.com/)
+![shipyard-horizontal-black](https://github.com/user-attachments/assets/48c891bb-d25f-4bd0-ad51-9c7da0cb086c)
 
 [We are an independent engineering team](https://ipshipyard.com/) maintaining, operating, and developing
 many of the important tools and services in the [IPFS](https://ipfs.tech/) and [Libp2p](https://libp2p.io/) ecosystem.