HOFF-45 Upgrade to Govuk design system

[sulthan-ahmed]

What

This is updating HOF to the latest govuk design system.

More details

• This is designed with single question per page in mind
• You can turn set the mixin/component as the heading with isPageHeading: true
• Use nhs hof version as a baseline https://gitlab.com/nhsbsa/Libraries/hof-govfrontend-v3
• Get assets straight from govuk design
• update all components to use latest stylings
• update template-minxins.js to use dynamic reveals
• update template-minxins.js to use isPageHeading
• update date component to use the different styling
• amend unit tests
• remove duplicate partials
• filter out empty views

Tested

• Via the sandbox app
• In rotm and in the environment using a beta package

[sulthan-ahmed]

I need to add multiQuestionPage config which will remove the h1 from components when there are multiple questions on a page

[SarahJaneLuff]

Looks good, tested ok with new DOB field highlight changes from HOF 19.14.9.

[sulthan-ahmed]

This is for the nhs app nhs Immigration health surcharge form https://gitlab.com/nhsbsa/immigration-health-surcharge/ihs-health-forms-app