Release 13.1.0

[lfdebrux]

What

Release version 13.1.0 of the GOV.UK Prototype Kit with new features and fixes.

Why

So users can get the latest version of our code.

Who needs to work on this

Content designer, developer

Who needs to review this

Content designer, developer, product manager

Done when

• [ ] Draft release notes
• [ ] Create release following process
• [ ] Release is available on npm
• [ ] Let users know about the update

[joelanman]

currently blocked by #1872

[NickColley]

This can be closed @joelanman

[joelanman]

ha thanks!