Refactor links.yaml to add ArXiv link

src/links.yaml

@@ -7,3 +7,6 @@
 - name: Leaderboard
   icon: fa-solid fa-trophy
   url: https://huggingface.co/spaces/lmms-lab/LiveBench
+- name: ArXiv
+  icon: <i class="fa-solid fa-file"></i>
+  url: https://arxiv.org/abs/2202.09707