Use HTML publication header variant of inverse header

[hannalaakso]

📣 On-going work to be aware of

Routes in this application are being migrated to another application, please check with #govuk-patterns-and-pages when making changes.

• #govuk-patterns-and-pages have been notified of this change

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What

The HTML publication header variant was previously documented in the gem, but not actually applied anywhere in the code.

We now need to set it, as it differs from the default header by using a deeper blue background instead of the default light blue.

Review URL: https://government-frontend-pr-3860.herokuapp.com/government/publications/car-show-me-tell-me-vehicle-safety-questions/car-show-me-tell-me-vehicle-safety-questions

Why

https://gov-uk.atlassian.net/jira/software/c/projects/NAV/boards/1422?selectedIssue=NAV-18210

Anything else

Depends on

alphagov/govuk_publishing_components#5053 - I've added a Do Not Merge label until the gem PR has been merged.

Fixes https://gov-uk.atlassian.net/jira/software/c/projects/NAV/boards/1422?selectedIssue=NAV-18210.

[andysellick]

@hannalaakso just to let you know we're close to completing the migration of this route to frontend: alphagov/frontend#4950

[jon-kirwan]

@hannalaakso just to let you know we're close to completing the migration of this route to frontend: alphagov/frontend#4950

Thanks, @andysellick. The changes in this PR are quite small (just opened for review now, but I don’t expect much else to change).

If I can get these changes released before you finish the migration, we can update your branch to include them - it’s only a line or two. Otherwise, if the migration goes in first, I’ll make a note to update the template in Frontend after our changes are merged.

Does that sound okay?

[andysellick]

Thanks @jon-kirwan I'm in the middle of doing that route at the moment so I'll make a note to update it myself.

[MartinJJones]

The change looks good to me and it should be possible to merge in advance of the latest inverse header style changes in the gem to avoid the wrong background colour being applied, or include the gem bump as part of this PR