[#467] Added multi-line header option.

[febdao]

Checklist before requesting a review

• I have formatted the subject to include the issue number
  as [#123] Verb in past tense with a period at the end.
• I have provided information in the Changed section about WHY something was
  done if this was a bespoke implementation.
• I have performed a self-review of my code.
• I have commented on my code, particularly in hard-to-understand areas.
• I have added tests that prove my fix is effective or that my feature works.
• I have run new and existing relevant tests locally with my changes,
  and they have passed.
• I have provided screenshots, where applicable.

Changed

1. Added multi-line option for header.

Screenshots

[github-actions]

🚀 Deployed on https://67dcc4fc5645d03440e896dd--civictheme-uikit.netlify.app

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 13.09%. Comparing base (13e708b) to head (1214377).
Report is 10 commits behind head on feature/447-primary-nav.

Additional details and impacted files

@@                     Coverage Diff                     @@
##           feature/447-primary-nav     #506      +/-   ##
===========================================================
+ Coverage                    12.64%   13.09%   +0.45%     
===========================================================
  Files                           36       20      -16     
  Lines                         1131     1092      -39     
  Branches                       256      228      -28     
===========================================================
  Hits                           143      143              
+ Misses                         798      774      -24     
+ Partials                       190      175      -15     

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[febdao]

Hi @alan-cole
This pull request need the code from #481 for the navigation updated but it's still ready for CR.
Please review it and merge it after #481 is merged.
Cheers,

[alan-cole]

Maybe put this one on hold for now. We need design to provide more guidance on how and what should be supported in header.