Feature/docs url control

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (4c74ee5) 97.51% compared to head (0c69ea7) 97.51%.

Files	Patch %	Lines
blacksheep/server/openapi/ui.py	96.55%	1 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #449 +/- ## ========================================== - Coverage 97.51% 97.51% -0.01% ========================================== Files 67 67 Lines 6330 6353 +23 ========================================== + Hits 6173 6195 +22 - Misses 157 158 +1 ```

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[RobertoPrevato]

Original PR