打开/下载文件加速

1. 项目内的文件

   比如要下载 https://github.com/junegunn/vim-plug/plug.vim，那可以将 github.com 替换成 cdn.jsdelivr.net/gh，最终地址 https://cdn.jsdelivr.net/gh/junegunn/vim-plug/plug.vim

   参考 https://mazhuang.org/2020/05/01/cdn-for-github-pages/

2. Releases 里的文件

   比如要下载 https://github.com/PowerShell/PowerShell/releases/download/v7.1.0-preview.6/PowerShell-7.1.0-preview.6-win-x64.zip，可以将 github.com 替换成 download.fastgit.org，最终地址 https://download.fastgit.org/PowerShell/PowerShell/releases/download/v7.1.0-preview.6/PowerShell-7.1.0-preview.6-win-x64.zip

   参考 https://toolwa.com/github/