correct email address and tune format (#4)

Author: dyuliu

_includes/contact.html

@@ -18,16 +18,16 @@
     </div>
     <div class="row justify-content-lg-center my-4">
       <div class="col-auto mb-4"> 
-        <h4>Address</h4>
+        <h4><i>Address</i></h4>
         <address>
-          <b>MIT Data to AI Lab</b><br>
+          <b><i>Data to AI Lab</i></b><br>
           MIT Stata Center<br>
           32 Vassar St, Room 32-D712<br>
           Cambridge, MA 02139
         </address>
 
-        Email Address <br>
-        <a href="mailto:dailabmit@gmail.com">dailabmit@gmail.com</a>
+        <b><i>Email</i></b> <br>
+        <a href="mailto:{{ site.email }}">{{ site.email }}</a>
       </div>
       <div class="col-md-6 col-lg-5 offset-lg-1">
         <div class="embed-responsive embed-responsive-1by1">