feat: add accents

[mvllow]

This will show in the help menu but remain undocumented in the readme for now in case the api changes

Closes #12

[OyuDays]

I have tested and this seems to be very unfinished
here are the issues i encountered (ordered from smallest to biggest issue):

1. the option is not in the help menu like you said it would be.
2. it does not work on folders, i think the reason is something like that the folders for the accents are never made, but are still attempted to be accessed
3. $accent only gives the accent name, not the actual color, is this intentional? am i missing something?

[mvllow]

Doh, not sure why my brain thought we wanted to use the colour name instead of the value. Should be fixed now, as well as adding the flag. It's been quite a while since I've worked in this codebase 😅

I'll have to think about the folders ~

[OyuDays]

i suppose it would be easier to just call the folders as unintended and just leave it at that
even in my case where i do use the folders, i could very easily switch away from it

[mvllow]

Closing in favour of [https://github.com/rose-pine/rose-pine-bloom]