Banner: trim to 2 rows; center the card heading

README.md

@@ -34,7 +34,7 @@ configs:
     path: data/images/test/metadata.jsonl
 ---
 
-# SSDD: SAR Ship Detection Dataset (Object Detection)
+<h1 align="center">SSDD: SAR Ship Detection Dataset (Object Detection)</h1>
 
 <p align="center">
   <img src="ssdd_banner.jpg" alt="SSDD Dataset Banner"/>