docs: use mkdocs admonition for warning

S1M0N38 · S1M0N38 · commit 11a0b0e017df · 2025-07-23T12:20:54.000+02:00
diff --git a/docs/contributing.md b/docs/contributing.md
@@ -142,7 +142,8 @@ basedpyright
 
 ### Testing Requirements
 
-**⚠️ Important**: All tests require Balatro to be running in the background.
+!!! warning
+    All tests require Balatro to be running in the background.
 
 ```bash
 # Start Balatro first
