Refactor important section formatting in contributing guidelines

Author: rob93c

CONTRIBUTING.md

@@ -4,9 +4,8 @@ This project welcomes any change, improvement, or suggestion!
 
 If you'd like to help its development feel free to open a new issue and raise a pull request.
 
-## IMPORTANT
-
-If you'd like to work on an existing issue, kindly **ask** for it to be assigned to you.
-
-Do you have any struggle with the issue you are working on? Feel free to **tag me** in it _and/or_ open a draft pull
-request.
+> [!IMPORTANT]
+> If you'd like to work on an existing issue, kindly **ask** for it to be assigned to you.
+>
+> Do you have any struggle with the issue you are working on? Feel free to **tag me** in it _and/or_ open a draft pull
+> request.