add XT weblink.

Author: Junze888

_includes/nav.html

@@ -67,6 +67,7 @@
                     </a>
                     <div class="dropdown-menu" aria-labelledby="Exchanges">
 <!--                        <a class="dropdown-item" href="https://www.coinex.com/exchange/XDAG-USDT" target="_blank">Coinex </a>-->
+                        <a class="dropdown-item" href="https://www.xt.com/en/trade/xdag_usdt" target="_blank">XT</a>
                         <a class="dropdown-item" href="https://www.mexc.com/exchange/XDAG_USDT" target="_blank">MEXC</a>
                         <a class="dropdown-item" href="https://www.uubiter.com/spot/#/index/xdag_usdt" target="_blank">UUBiter</a>
                         <a class="dropdown-item" href="https://bikingex.com/spot/trade-spot/XDAG_USDT" target="_blank">BiKing</a>

_layouts/default.html

@@ -254,7 +254,7 @@ <h5 class="modal-title" id="staticBackdropLabel"><img src="{{site.url}}/assets/i
                                             <td>stratum solo</td>
                                         </tr>
                                         <tr>
-                                            <td rowspan="1" >xdagminer pool</td>
+                                            <td rowspan="1" >xdagminer</td>
                                             <td rowspan="1"><a href="http://equal.xdagminer.com" target="_blank">http://equal.xdagminer.com</a><br/></td>
                                             <td rowspan="1" >&#10004;</td>
                                             <td>equal.xdagminer.com:13003<i class="fa fa-copy" onclick="copyAddress('equal.xdagminer.com:13003')"  data-toggle="tooltip" data-placement="top" title="Address copied to Clipboard" data-trigger="click"></i></td>