Prep task list for release, with service manual guidance

[sarawilcox]

We have a PR for the frontend: nhsuk/nhsuk-frontend#969. This will need finalising for release.

Then we need a page in the design system to support it.

Backlog issue: nhsuk/nhsuk-service-manual-community-backlog#304

GOV.UK design system: https://design-system.service.gov.uk/components/task-list/

To do

• Review component and pattern guidance in service manual (Add task list component and pattern #2031)
• Content 2i for guidance
• Remove commented out code
• Remove temp fix to let us see examples
• Finalise frontend code / PR (Add task-list component macro nhsuk-frontend#969)
• Design review
• Frontend testing

[sarawilcox]

Released today:

• task list component
• complete multiple tasks pattern