Grey your hexo site on the mourning day
哀悼日专用 Hexo 插件，开启后全站灰色
$ npm i hexo-filter-mourning --saveIn your site's _config.yml:
mourning:
# It's recommended to disable it when not in use
enable: true
# Specify the date(s) to be greyed out. You can set dates in the format yyyy-MM-dd or MM-dd
day:
- 04-04
- 05-12
- 09-18