Use nginx to serve built files

[nbr23]

Resolves #842
Better suited than python + handles sigterm better

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[HarelM]

No reason not to add this.
The only difference is that this exposes port 80 while the original image eposes port 8888.
Having said that this is a breaking change version and it makes sense.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a22476c) 56.77% compared to head (ec96f45) 56.77%.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #808   +/-   ##
=======================================
  Coverage   56.77%   56.77%           
=======================================
  Files         104      104           
  Lines        2929     2929           
  Branches      674      674           
=======================================
  Hits         1663     1663           
  Misses       1266     1266           

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