New: Add page header graphic (fix #557)

[swashbuck]

Fix #557

New

• Adds new page header graphic option for including a logo above the page title.

Notes

• Page header graphic max width must be set via custom styling
• This could alternatively be implemented in Core rather than Vanilla. This would be implemented directly in the page template rather than needing to use jQuery to inject the element. However, we would have some page header settings in Vanilla and some in Core which may be confusing.

Screenshots

[kirsty-hames]

Hey @swashbuck, I agree it makes sense to keep page header settings in Vanilla rather than split. Whilst consistency in implementation is preferred (page template rather than jQuery) it's important to consider end user experience. Having split settings within AAT would be confusing.

I've raised a few comments but otherwise works as expected thanks 👍

[swashbuck]

Thanks, @kirsty-hames . I've addressed your three comments and implemented the changes.

[github-actions]

🎉 This PR is included in version 9.32.0 🎉

The release is available on GitHub release

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