Align the default link states with Gov

[paulfourniercarey]

What

Gov reworked their link states to make them more readable, it makes sense to align with this unless we have research that can show it work better as it is.

Why

It better aligns with Gov and is often seen in the wild too.
Blog post from 2021
https://designnotes.blog.gov.uk/2021/07/07/making-links-easier-to-see-and-read-on-gov-uk/

[frankieroberto]

@paulfourniercarey thanks for adding! This seems like a good thing to port across from the GOV.UK Design System to me. @anandamaryon1 agree?

[anandamaryon1]

I agree this is worth exploring. Will need some testing, since we use a different font and hover state.