update zh-cn/application-dev/website.md.

Signed-off-by: Nsunyue <sunyue77@h-partners.com>

zh-cn/application-dev/website.md

@@ -817,6 +817,7 @@
       - [@ohos.screenLock (锁屏管理)](reference/apis/js-apis-screen-lock.md)
       - [@ohos.systemTime (设置系统时间)](reference/apis/js-apis-system-time.md)
       - [@ohos.wallpaper (壁纸)](reference/apis/js-apis-wallpaper.md)
+      - [@ohos.systemTimer(设置系统时间)](js-apis-system-timer.md)
       - [Timer (定时器)](reference/apis/js-apis-timer.md)
     - 设备管理
       - [@ohos.batteryInfo (电量信息)](reference/apis/js-apis-battery-info.md)