Design System: Change brand colour to meet Accessibility

[carapang]

Need

As a user of Design System, I need to make sure I am using the correct brand colour on all platforms so that the colour meets our accessibility standard

Description

After doing the Accessibility audit on Website, we have updated:

• the green brand color (to #558200)
• focus colour to orange
• Error red

New brand colours are here: https://barnardosorguk.sharepoint.com/sites/bs-ss-webteam/sitepages/brand-colours.aspx?web=1

Acceptance criteria

• [ ] Changed to new green, focus colour and error red

[ritapatel7]

@carapang I may have missed a step last time and therefore may not have had up to date dependancies. Not sure if this will still go through but I think it may. Waiting for Jeremy and Manisha to PR it then will give it a go to move forward to next step.

[ritapatel7]

I have tried to update accessibility colours and pushed on github but its showing amber. It seems like the stylelint dependancies are causing an issue. I am leaving this ticket on the side for now and will come back to it when I can