Step by step UI pattern should match gov.uk design system

[tonypaulbarker]

This was raised at tech drop in at LocalGov Camp.

The sidebar component of step by steps has title as links. This means that users click on the link either expecting the section to expand or without interacting at all with the summary.

https://demo.localgovdrupal.org/adult-health-and-social-care/step-by-step/request-support-adult-step-step/apply-financial-support

Instead, to match the gov.uk design system and improve the UX the header link should also expand the summary with action links included in the summary.

See the pattern at
https://design-system.service.gov.uk/patterns/step-by-step-navigation/
and an example at
https://www.gov.uk/apply-first-provisional-driving-licence?step-by-step-nav=e01e924b-9c7c-4c71-8241-66a575c2f61f