update(lab-members): reorganize lab member section

- Added a placeholder page for new PhD students
- Moved some graduate students to the Alumni section

Author: kyuchia

lab_members/masters/lucas_march/index.html renamed to lab_members/alumni/lucas_march/index.html

@@ -127,12 +127,15 @@ <h3 class="people-title"> PhD </h3>
           <li><a href="../lab_members/phd/hanwen_zhang/">Hanwen Zhang</a><a
               href="../lab_members/phd/hanwen_zhang/"><img class="member_photo_list"
               src="../assets/lab_members/thumbnail/placeholder.png" /></a></li>
+          <!-- <li><a href="../lab_members/phd/zihsyuan_lin/">Zih-Syuan Lin</a><a
+              href="../lab_members/phd/zihsyuan_lin/"><img class="member_photo_list"
+              src="../assets/lab_members/thumbnail/placeholder.png" /></a></li> -->
+          <!-- <li><a href="../lab_members/phd/wenye_ma/">Wenye Ma</a><a
+              href="../lab_members/phd/wenye_ma//"><img class="member_photo_list"
+              src="../assets/lab_members/thumbnail/placeholder.png" /></a></li> -->
         </ul>
         <h3 class="people-title"> Masters </h3>
         <ul class="member-list">
-          <li><a href="../lab_members/masters/lucas_march/">Lucas March</a><a
-              href="../lab_members/masters/lucas_march/"><img class="member_photo_list"
-                src="../assets/lab_members/thumbnail/placeholder.png" /></a></li>
           <li><a href="../lab_members/masters/cole_thierrin/">Cole Thierrin</a><a
               href="../lab_members/masters/cole_thierrin/"><img class="member_photo_list"
                 src="../assets/lab_members/thumbnail/placeholder.png" /></a></li>
@@ -160,9 +163,6 @@ <h3 class="people-title"> Masters </h3>
         </ul>
         <h3 class="people-title"> Undergraduate </h3>
         <ul class="member-list">
-          <li><a href="../lab_members/undergraduate/yueqiao_zhang/">Yueqiao Zhang</a><a
-            href="../lab_members/undergraduate/yueqiao_zhang/"><img class="member_photo_list"
-              src="../assets/lab_members/thumbnail/yueqiao_zhang.JPG" /></a></li>
           <li><a href="../lab_members/undergraduate/antoine_phan/">Antoine Phan</a><a
             href="../lab_members/undergraduate/antoine_phan/"><img class="member_photo_list"
               src="../assets/lab_members/thumbnail/placeholder.png" /></a></li>
@@ -353,6 +353,9 @@ <h3 class="people-title"> Alumni </h3><a href="https://ddmal.ca/people/">Past gr
           <li><a href="../lab_members/alumni/ling-xiao_yang/">Ling-Xiao Yang</a><a
               href="../lab_members/alumni/ling-xiao_yang/"><img class="member_photo_list"
                 src="../assets/lab_members/thumbnail/placeholder.png" /></a></li>
+          <li><a href="../lab_members/masters/lucas_march/">Lucas March</a><a
+              href="../lab_members/masters/lucas_march/"><img class="member_photo_list"
+                src="../assets/lab_members/thumbnail/placeholder.png" /></a></li>
           <li><a href="../lab_members/alumni/mahtab_ghamsari/">Mahtab Ghamsari</a><a
               href="../lab_members/alumni/mahtab_ghamsari/"><img class="member_photo_list"
                 src="../assets/lab_members/thumbnail/placeholder.png" /></a></li>
@@ -477,6 +480,9 @@ <h3 class="people-title"> Alumni </h3><a href="https://ddmal.ca/people/">Past gr
                 class="member_photo_list" src="../assets/lab_members/thumbnail/yaolong_ju.jpg" /></a></li>
           <li><a href="../lab_members/alumni/yihong_luo/">Yihong Luo</a><a href="../lab_members/alumni/yihong_luo/"><img
                 class="member_photo_list" src="../assets/lab_members/thumbnail/placeholder.png" /></a></li>
+          <li><a href="../lab_members/undergraduate/yueqiao_zhang/">Yueqiao Zhang</a><a
+              href="../lab_members/undergraduate/yueqiao_zhang/"><img class="member_photo_list"
+                src="../assets/lab_members/thumbnail/yueqiao_zhang.JPG" /></a></li>
           <li><a href="../lab_members/alumni/yu_hua/">Yu Hua</a><a href="../lab_members/alumni/yu_hua/"><img
                 class="member_photo_list" src="../assets/lab_members/thumbnail/placeholder.png" /></a></li>
           <li><a href="../lab_members/alumni/yue%20phillis_ouyang/">Yue Phillis Ouyang</a><a