- Upgrade for Wagtail 5.0+ compatibility
- Drop tests for Wagtail < 5.2 due to EOL
- Drop tests for Django < 4.2
- Use the latest version of the NHS.UK frontend library (v9.1.0)
- Header update inline with the frontend library
- Add column-based footer functionality with customisable columns and links
- Update footer template to support column-based layout
- Add FooterSettingsColumns and FooterColumnLinks models for footer customisation