feat: Add header styles inclusion

[Lunyachek]

Header styles inclusion like it done in frontend-app-learning - https://github.com/openedx/frontend-app-learning/blob/master/src/index.scss#L7

It can be useful, for example, for the potential using of cookie banner

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (59a7d07) to head (8f248e0).
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #321   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files          109       109           
  Lines         1078      1078           
  Branches       159       159           
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  Hits          1078      1078           

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[arbrandes]

It makes sense, but I wonder what the impact is, visually. I can find some header-specific CSS here, and I'm worried that bringing in the default styles will break them, somehow.

Can we get before-after screenshots?

[mphilbrick211]

Hi @Lunyachek! Just following up on this.

[mphilbrick211]

Sorry... didn't mean to close!