Overwrite AppBar default orange color

[fiskus]

We use navTheme.palette.seconday.dark for color, but AppBar extracts .main (so, <AppBar color="secondary" doesn't help) Sometimes, this primary.main orange flashes during first load (maybe even once after deploy)

[codecov[bot]]

Codecov Report

Merging #2969 (964f38e) into master (fe2c6b2) will decrease coverage by 50.36%. The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #2969       +/-   ##
===========================================
- Coverage   89.31%   38.95%   -50.37%     
===========================================
  Files          76      615      +539     
  Lines        9519    27462    +17943     
  Branches        0     4003     +4003     
===========================================
+ Hits         8502    10697     +2195     
- Misses       1017    15629    +14612     
- Partials        0     1136     +1136     

Flag	Coverage Δ
api-python	90.71% <ø> (ø)
catalog	12.23% <ø> (?)
lambda	87.30% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
catalog/app/containers/NavBar/NavBar.tsx	18.32% <ø> (ø)
...alog/app/containers/Bucket/WorkflowsConfigLink.tsx	42.85% <0.00%> (ø)
catalog/app/website/pages/Example.tsx	0.00% <0.00%> (ø)
catalog/app/containers/Bucket/requests/package.ts	43.47% <0.00%> (ø)
...min/RolesAndPolicies/gql/PolicyDelete.generated.ts	0.00% <0.00%> (ø)
catalog/app/constants/urls.js	100.00% <0.00%> (ø)
catalog/app/utils/img2x.js	0.00% <0.00%> (ø)
catalog/app/embed/Embed.js	0.00% <0.00%> (ø)
...log/app/containers/Bucket/PackageDialog/actions.ts	0.00% <0.00%> (ø)
catalog/app/components/Markdown/Markdown.tsx	0.00% <0.00%> (ø)
... and 530 more

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[fiskus]

Still not fixed. I think we need a more in-depth refactoring of layout