[WIP] init for brain hack needs work

[thinknoack]

adds to the search ctx and params to search for datasets where brain_initiative == "true".

also contains the various styling and components to accommodate the new NIH BI portal.

[codecov]

Codecov Report

Attention: Patch coverage is 31.27753% with 156 lines in your changes missing coverage. Please review.

Project coverage is 47.66%. Comparing base (1c61144) to head (1523ac1).
Report is 8 commits behind head on master.

Files with missing lines	Patch %	Lines
...neuro-app/src/scripts/search/inputs/nih-select.tsx	20.63%	50 Missing ⚠️
...euro-components/src/search-page/ModalityHeader.tsx	2.94%	33 Missing ⚠️
...s/openneuro-components/src/facets/SingleSelect.tsx	28.94%	27 Missing ⚠️
...nneuro-app/src/scripts/search/search-container.tsx	14.28%	18 Missing ⚠️
...openneuro-app/src/scripts/search/search-routes.tsx	0.00%	14 Missing ⚠️
...euro-app/src/scripts/search/use-search-results.tsx	0.00%	11 Missing ⚠️
...neuro-app/src/scripts/search/search-params-ctx.tsx	0.00%	2 Missing ⚠️
...penneuro-components/src/search-page/SearchPage.tsx	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3314      +/-   ##
==========================================
+ Coverage   47.42%   47.66%   +0.23%     
==========================================
  Files         587      593       +6     
  Lines       37285    37857     +572     
  Branches     1243     1272      +29     
==========================================
+ Hits        17683    18044     +361     
- Misses      19415    19626     +211     
  Partials      187      187              

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