重写将文件预览；本地引入font-awesome字体；

public/cdn/fontawesome-free-6.4.0-web/less/_icons.less

@@ -0,0 +1,9 @@
+// specific icon class definition
+// -------------------------
+
+/* Font Awesome uses the Unicode Private Use Area (PUA) to ensure screen
+   readers do not read off random characters that represent icons */
+
+each(.fa-icons(), {
+  .@{fa-css-prefix}-@{key}::before { content: @value; }
+});