docs: update readme header to link to nixopus.com

Author: raghavyuva

README.md

@@ -1,5 +1,5 @@
 <div align="center">
-<img width="1800" height="520" alt="Heading(4)" src="https://github.com/user-attachments/assets/e103a9df-7abf-4f78-b75a-221331231247" />
+<a href="https://nixopus.com"><img width="1800" height="520" alt="Heading(4)" src="https://github.com/user-attachments/assets/e103a9df-7abf-4f78-b75a-221331231247" /></a>
 </div>