Move inline css and js to external files for SwaggerUI and ReDoc

[junior-santana]

Pull Request

The issue or feature being addressed

Resolves #2881.

Details on the issue fix or feature implementation

Moved inline javascript to separate files
ReDoc: Moved inline CSS to separate file
SwaggerUi: Reused CSS file from the package

Middleware changes to respond with corresponding files

[cremor]

The default config file also sets plugins: [SwaggerUIBundle.plugins.DownloadUrl]. I don't know what that does, but maybe it should be set here too?

[martincostello]

I suggest we leave it as is, particularly if we don't know why it isn't there already.

[martincostello]

I suggest we leave it as is, particularly if we don't know why it isn't there already.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.44%. Comparing base (9b7c0dd) to head (f4a9d42).
Report is 6 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2965      +/-   ##
==========================================
+ Coverage   90.34%   90.44%   +0.10%     
==========================================
  Files          72       74       +2     
  Lines        2839     2869      +30     
  Branches      446      452       +6     
==========================================
+ Hits         2565     2595      +30     
  Misses        274      274              

Flag	Coverage Δ
Linux	90.44% <100.00%> (+0.10%)	⬆️
Windows	81.07% <20.00%> (-9.28%)	⬇️
macOS	90.44% <100.00%> (+0.10%)	⬆️

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