[FEATURE] Using local icons/svg in titile and menu ("pre") 如何使用本地SVG文件作为图标

[megastarmie]

Describe the feature you want 描述你的功能需求

Hi, I would like to use local svg as the icon for the title and menu instead of font awesome.
I notice there is a pre = "" for the title and menu tap in config.toml, but what kind of information/code should I use to load the local svg?
Thanks!

最近需要用到本地svg作图标， 用在导航栏。 config.toml文件中有 pre ="" 的选项，想了解一下怎么调用本地svg

感谢！