Added marzi2025hierarchical news

Author: tommasomarzi

_data/news.yml

@@ -1,8 +1,9 @@
 - date: 2025/10
   text: >
-    A new preprint about our latest research!
-    <a href="https://arxiv.org/abs/2509.24728">Beyond Softmax: A Natural Parameterization for Categorical Random Variables</a> (Manenti and Alippi)
-    Check it out!
+    Two new preprints about our latest research!
+    <a href="https://arxiv.org/abs/2509.24728">Beyond Softmax: A Natural Parameterization for Categorical Random Variables</a> (Manenti and Alippi) and 
+    <a href="https://arxiv.org/abs/2507.23604">Hierarchical Message-Passing Policies for Multi-Agent Reinforcement Learning</a> (Marzi et al).
+    Check them out!
 - date: 2025/09
   text: 'Our papers <a href="https://arxiv.org/abs/2506.15507">Over-squashing in Spatiotemporal Graph Neural Networks</a> (Marisca et al.) and <a href="#">Equilibrium Policy Generalization: A Reinforcement Learning Framework for Cross-Graph Zero-Shot Generalization in Pursuit-Evasion Games</a> (Lu et al.) have been accepted at <strong><a href="https://neurips.cc">NeurIPS 2025</a></strong>!'
 - date: 2025/06