Add ids to the advisory board member lists that can be used as anchors.

With those, we can for example directly link to the list of
advisory board members as
https://scala.epfl.ch/#advisory-board-member-list

Author: sjrd

_layouts/frontpage.html

@@ -336,7 +336,7 @@ <h2>Who are we?</h2>
       <div class="supporters">
         <div class="container">
           <div class="row">
-            <div class="col-md-12 text-center">
+            <div class="col-md-12 text-center" id="brought-to-you-by">
               <!-- <div class="sect-header">Brought to you by</div> -->
               <h2>Brought to you by</h2>
             </div>
@@ -345,7 +345,7 @@ <h2>Brought to you by</h2>
                <a href="http://epfl.ch" style="border: none;" target="_blank"><img src="{{ site.baseurl }}/resources/img/epfl.png" /></a>
               </div>
               <br/><br/>
-              <div class="subtitle col-sm-12">Advisory Board members:</div>
+              <div class="subtitle col-sm-12" id="advisory-board-member-list">Advisory Board members:</div>
               <div class="col-sm-3 supporter-logo">
                 <a href="http://www.goldmansachs.com/" style="border: none;" target="_blank"><img src="{{ site.baseurl }}/resources/img/goldman.png" /></a>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
               </div>
@@ -368,13 +368,13 @@ <h2>Brought to you by</h2>
                 <a href="https://lunatech.com/" style="border: none;" target="_blank"><img src="{{ site.baseurl }}/resources/img/lunatech.png" /></a>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
               </div>
             <!--</div>-->
-              <span class="subtitle col-sm-12">Contributor members:</span>
+              <span class="subtitle col-sm-12" id="contributor-member-list">Contributor members:</span>
               <div class="col-sm-12 supporter-logo">
                 <a href="https://virtuslab.com/" style="border: none;" target="_blank"><img src="{{ site.baseurl }}/resources/img/virtuslab.png" /></a>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
               </div>
             <!--</div>-->
               <!--
-              <span class="subtitle col-sm-12">Affiliate members:</span>
+              <span class="subtitle col-sm-12" id="affiliate-member-list">Affiliate members:</span>
               <div class="col-sm-12 supporter-logo">
                 <a href="https://www.example.com/" style="border: none;" target="_blank"><img src="{{ site.baseurl }}/resources/img/example.png" /></a>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
               </div>