added WL image to people page

Author: jeremymanning

data/people.xlsx

@@ -216,7 +216,7 @@ <h3>sam haskel | undergrad</h3>
                     <p>Sam is a Quantitative Social Science and Economics double major. He is interested in how social peer influences shape beliefs and affect how people make decisions.</p>
                 </div>
                 <div class="person-card">
-                    <img src="images/people/placeholder.png" alt="will lehman">
+                    <img src="images/people/will_lehman.png" alt="will lehman">
                     <h3>will lehman | undergrad</h3>
                     <p>Will is a '27 from Salt Lake City, Utah. He likes skiing, playing hockey, and working on new projects.</p>
                 </div>