【功能建议】提几个小小的优化点

[yanshifly]

• 能否增加让设定的计划在到达前通过邮件通知或其他形式进行通知
• 可以通过更改设定的方式将自动备份模式切换为本地Markdown
• 编辑菜单中增加左侧文件栏隐藏的按钮（屏幕小导致编辑区域很窄，虽然有快捷键关闭但是有时候按快捷键比较麻烦）

[xiaozzzi]

我记录一下，作为后续的优化项

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