Create 'community' section

[oli-rose28]

What

This is a section of the Prototype Kit to let users know how to get involved (for example, on Slack, Github, via our mailing list or joining a workshop. Similar to the Design System: https://design-system.service.gov.uk/community/

Who needs to work on this

Designer
Content Designer

Who needs to review this

Designer
Content Designer

Done when

• We have published the content for the community section
• Users can navigate to and access the section from the site