Get link component calculating its own text underline thickness from presets

[oliverabrahams]

No description provided.

[jamesmockett]

Akemi is reviewing the default values for underline thickness as it varies across browsers, and whether we can calculate this as a percentage to simplify our code and remove the need for the custom property in the presets.

[SiAdcock]

@jamesmockett shall we chase Faye at the next DS/CSTI planning session?

[jamesmockett]

@jamesmockett shall we chase Faye at the next DS/CSTI planning session?

Due to hack days there hasn't been a DS/CSTI planning session since the last CSTI one, but will chase this next week. We could simply close this ticket as there's nothing we urgently need to do here? This was more of a nice to have to clean up the code a little, but we can deal with it once the DS team have made a decision and ask us to update the underline styles. (The plan seems to be to remove the custom underline styles completely and use the browser defaults.)

[SiAdcock]

@jamesmockett will prototype removing the custom styles in Storybook and show to Faye.

We should capture how this looks in different browsers using Browserstack.