Add navigation button to blog post 3

Author: juarezgr

blog/post3.html

@@ -56,6 +56,9 @@ <h3>Posted on: 12/29/2025</h3>
             <p><strong>Next week:</strong> Grad Apps 2025 😭</p>
 
             <p>Let's reflect on my graduate school application process 🥲</p>
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+										</ul>
 
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