Live relative-time counters via shared [data-ts] ticker in layout foot (#46)

web/templates/unlock.html

@@ -15,7 +15,7 @@
         <button class="btn" type="submit">Unlock</button>
       </form>
     </div>
-    <div class="foot">Created {{.CreatedAgo}}</div>
+    <div class="foot">Created <span data-ts="{{.CreatedAtUnix}}">{{.CreatedAgo}}</span></div>
   </div>
 </div>
 <script>