版本：
文件：
- https://cdn.bootcdn.net/ajax/libs/docsify-sidebarfooter/5.0.7/docsify-sidebar.js
- https://cdn.bootcdn.net/ajax/libs/docsify-sidebarfooter/5.0.7/docsify-sidebar.min.js
Add a footer notice for Docsify.js