Update CS for Nature Conservation label styling

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: mrigger

content/home/welcome.md

@@ -65,7 +65,7 @@ Core Areas:
 * Software Engineering
 * Systems
 * Programming Languages
-* CS for Nature Conservation 🌿 *(new)*
+* CS for Nature Conservation 🆕
 
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