fix font

Author: mobeicanyue

_config.fluid.yml

@@ -235,7 +235,7 @@ custom_js:
 
 # 指定自定义 .css 文件路径，用法和 custom_js 相同
 # The usage is the same as custom_js
-custom_css: https://cdn.jsdelivr.net/gh/CMBill/lxgw-wenkai-gb-web/fonts/lxgwwenkaigb-regular/result.min.css
+custom_css: https://cdn.jsdelivr.net/gh/CMBill/lxgw-wenkai-gb-web/fonts/lxgwwenkaigb-bold/result.min.css
 
 # 网页访问统计
 # Analysis of website visitors