免翻墙镜像跟进更新节点订阅功能
https://2049bbs.github.io/feed/节点id.xml
,如 https://2049bbs.github.io/feed/5.xml 订阅分享发现节点
CDN https://cdn.staticaly.com/gh/2049bbs/2049bbs.github.io/gh-pages/feed/节点id.xml?env=dev
,如 https://cdn.staticaly.com/gh/2049bbs/2049bbs.github.io/gh-pages/feed/5.xml?env=dev