Rename API endpoints in frontend and nginx.conf to match blockstream

frontend/src/app/components/about/about.component.html

@@ -73,7 +73,7 @@
     </tr>
     <tr>
       <td style="border: 0;">
-          <input class="form-control" type="text" value="wss://mempool.space/ws" readonly>
+          <input class="form-control" type="text" value="wss://mempool.space/api/v1/ws" readonly>
       </td>
     </tr>
   </table>