add codemmlu leaderboard

Author: NamCyan

leaderboards/codemmlu/index.html

@@ -137,7 +137,7 @@ <h3 class="fw-light text-nowrap">
             alt="github"
             class="img-fluid"
         /></a>
-        <a href="https://arxiv.org/abs/2410.01999v1#:~:text=View%20a%20PDF%20of%20the%20paper%20titled%20CodeMMLU:%20A%20Multi-Task"
+        <a href="https://github.com/FSoft-AI4Code/CodeMMLU/blob/main/paper/main.pdf"
           ><img
             src="https://img.shields.io/badge/📝 paper-%23121011.svg?style=for-the-badge"
             alt="paper"