fix: using bootcss cdn instead of mathjax official one because the official cdn has been closed #1712
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发现mathjax cdn访问很慢,查询后发现,根据官方公布,今年4月份
cdn.mathjax.org
已经关闭了: https://www.mathjax.org/cdn-shutting-down/于是改用国内环境访问较快的: cdn.bootcss.com