Change Winners header gradient from yellow-green to yellow-darker yellow

- Use primary-600 (#DCC257) instead of green for gradient end color

Co-authored-by: openhands <openhands@all-hands.dev>

content.py

@@ -1008,11 +1008,11 @@ h3 .header-link-icon {
 }
 
 .winners-unified-table thead tr {
-    background: linear-gradient(to right, rgba(255, 225, 101, 0.15), rgba(188, 255, 140, 0.15));
+    background: linear-gradient(to right, rgba(255, 225, 101, 0.15), rgba(220, 194, 87, 0.25));
 }
 
 .dark .winners-unified-table thead tr {
-    background: linear-gradient(to right, rgba(255, 225, 101, 0.2), rgba(188, 255, 140, 0.2));
+    background: linear-gradient(to right, rgba(255, 225, 101, 0.2), rgba(220, 194, 87, 0.3));
 }
 
 .winners-unified-table .category-header {