[Components] ProseCheckbox

[bdrtsky]

Should I create ProseCheckbox component? Could be useful for creating TODO's. Right now we rendering empty native checkbox that looks like this:

## TODO

- [ ] one

I guess it shouldn't be inactive for Prose usage.

[nobkd]

This sounds like a great idea. It was also requested in nuxt/content#2202, so a base component should probably be implemented in nuxt/content as well.