Fix DOI badge to use simpler text

README.md

@@ -43,7 +43,7 @@ yaml:
     <img src="https://img.shields.io/badge/arXiv-2604.16353-red?style=flat-square" alt="arXiv">
   </a>
 <a href="https://doi.org/10.1007/978-3-032-21324-2_37">
-    <img src="https://img.shields.io/badge/DOI-10.1007_978-3-032-21324-2_37-green?style=flat-square" alt="DOI">
+    <img src="https://img.shields.io/badge/DOI-Springer-green?style=flat-square" alt="DOI">
   </a>
   <a href="https://creativecommons.org/licenses/by/4.0/">
     <img src="https://img.shields.io/badge/License-CC%20BY%204.0-blue?style=flat-square" alt="License: CC BY 4.0">