markdown-it渲染bug，涉及tree及脚注

[vincenteliang]

Releases 2.7.0-beta.0

Q1、在页面中使用以下markdown-it语法时会出现奇妙错误 ::: tree

• title :::

Q2、footnote脚注样式未生效

Q3、图片CDN路径未生效

环境： macOS 10.15.3 (19D76) hexo 4.2.0 markdown-it 10.0.0 markdown-it-container 2.0.0

[jason19970210-senao]

footnote syntax is not working for me.

something [^1] after something

[^1]: the footnote of something

Output should be: something [^1] after something

[^1]: the footnote of something

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Or it should render like this: https://blog.oniuo.com/post/inside-theme-showcase#footnote