fix(app): Show ORCID general error page for orcid/unknown error route.

[nellh]

Fixes #3459 and improves text for the error page.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 48.41%. Comparing base (a0ae008) to head (66c68d2).
⚠️ Report is 8 commits behind head on master.

Files with missing lines	Patch %	Lines
...openneuro-app/src/scripts/errors/orcid/general.jsx	0.00%	12 Missing ⚠️
...es/openneuro-app/src/scripts/errors/errorRoute.tsx	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3536      +/-   ##
==========================================
- Coverage   48.42%   48.41%   -0.02%     
==========================================
  Files         596      596              
  Lines       42245    42258      +13     
  Branches     1391     1391              
==========================================
  Hits        20459    20459              
- Misses      21617    21630      +13     
  Partials      169      169              

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