added JX to people page

Author: jeremymanning

data/people.xlsx

@@ -98,9 +98,9 @@ <h3><a href="https://contralto.github.io/" target="_blank">claudia gonciulea</a>
 
             <div class="people-grid">
                 <div class="person-card">
-                    <img src="images/people/placeholder.png" alt="jennifer xu">
+                    <img src="images/people/jennifer_xu.png" alt="jennifer xu">
                     <h3>jennifer xu | undergrad</h3>
-                    <p>Jennifer is planning to double major in Quantitative Social Science and Comparative Literature. She has a background in mathematics and programming, and is interested in the humanities and literature. She hopes to use machine learning to enhance our understanding of humanitarian issues.</p>
+                    <p>Jennifer is a Mathematical Data Science major. She is fascinated by understanding how machines "think," whether in biological neural networks or large language models. In her spare time, she enjoys watching videos of tech reviews of mice and keyboards.</p>
                 </div>
                 <div class="person-card">
                     <img src="images/people/om_shah.png" alt="om shah">