移除index-pc.html文件，内容更新到index.html中

2020/x-3/download/js/index-mobile-check.js

@@ -1,3 +1,3 @@
if (browser.device == 'PC') {   // 若是来自pc页面，跳转pc页面
  location.href = "index-pc.html";
  location.href = "index.html";
}

2020/x-3/download/js/index.js

@@ -1,5 +0,0 @@
if (browser.device == 'PC') {
  location.href = "index-pc.html";
} else {
  location.href = "index-mobile.html";
}