Update people (#327)

Author: github-actions[bot]

css/main.css

@@ -1244,7 +1244,7 @@ pre code {
   vertical-align: middle;
 }
 .links-of-author a::before {
-  background: #3274ff;
+  background: #4f7569;
   display: inline-block;
   margin-right: 3px;
   transform: translateY(-2px);

people/index.html

@@ -122,7 +122,6 @@ <h2 id="faculty">Faculty<a class="headerlink" href="#faculty"></a></h2>
 </ul>
 <h2 id="current-ph-d-students">Current Ph.D. Students<a class="headerlink" href="#current-ph-d-students"></a></h2>
 <ol>
-<li><a target="_blank" rel="noopener" href="http://www-personal.umich.edu/~amberljc/">Jiachen Liu</a></li>
 <li><a target="_blank" rel="noopener" href="https://jaewonchung.me/about">Jae-Won Chung</a></li>
 <li><a target="_blank" rel="noopener" href="https://insujang.github.io/">Insu Jang</a></li>
 <li><a target="_blank" rel="noopener" href="https://tctower.github.io/">Shiqi He</a></li>
@@ -139,6 +138,7 @@ <h2 id="ph-d-alumni">Ph.D. Alumni<a class="headerlink" href="#ph-d-alumni"></a><
 <li><a target="_blank" rel="noopener" href="https://www.linkedin.com/in/hasanalmaruf/">Dr. Hasan Al Maruf</a> (2023) → AMD ➠ Meta</li>
 <li><a target="_blank" rel="noopener" href="https://www.linkedin.com/in/fan-lai-a27764147/">Prof. Fan Lai</a> (2023) → Assistant Professor @UIUC</li>
 <li><a target="_blank" rel="noopener" href="https://www.linkedin.com/in/yiwen-zhang-a75719112/">Dr. Yiwen Zhang</a> (2024) → Google</li>
+<li><a target="_blank" rel="noopener" href="https://www.linkedin.com/in/jiachen-amber-liu-872506169/">Dr. Jiachen Liu</a> → Meta</li>
 </ol>
 <h2 id="current-non-ph-d-students">Current Non-Ph.D. Students<a class="headerlink" href="#current-non-ph-d-students"></a></h2>
 <ol>