Add location note to jobs page

LMS Lighthouse [#190]

lms/templates/static_templates/jobs.html

@@ -48,6 +48,7 @@
             <li>A great working experience where everyone cares and wants to change the world (no, we’re not kidding)</li>
           </ul>
           <p>While we appreciate every applicant&rsquo;s interest, only those under consideration will be contacted. We regret that phone calls will not be accepted.  Equal opportunity employer.</p>
+          <p>All positions are located in our Cambridge offices.</p>
         </div>
       </article>