Allow for more ui customizations

[timkpaine]

in advance of the UI overhaul, allow downstream projects to customize more aspects of the UI without having to have their own JS package.

[github-actions]

Test Results

649 tests  +649   641 ✅ +641   7m 10s ⏱️ + 7m 10s
  1 suites +  1     8 💤 +  8 
  1 files   +  1     0 ❌ ±  0 

Results for commit d5e4161. ± Comparison against base commit 5af304e.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

❌ Patch coverage is 92.94606% with 17 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.54%. Comparing base (5af304e) to head (d5e4161).

Files with missing lines	Patch %	Lines
csp_gateway/server/web/app.py	88.63%	10 Missing ⚠️
csp_gateway/server/middleware/api_key.py	40.00%	3 Missing ⚠️
csp_gateway/server/middleware/oauth.py	33.33%	2 Missing ⚠️
csp_gateway/server/middleware/simple.py	71.42%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #287      +/-   ##
==========================================
+ Coverage   87.38%   87.54%   +0.16%     
==========================================
  Files         142      143       +1     
  Lines       14635    14849     +214     
==========================================
+ Hits        12789    13000     +211     
- Misses       1846     1849       +3     

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