Readme.md container port changed to 80

[glebpinigin]

Activating maputnik with docker run requires to bind port 80 from container and not 8888, because nginx is running with default config and listening port 80

For npm run port 8888 is explicitly set up in config.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (bc5ecfa) 57.17% compared to head (38f1183) 57.17%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #881   +/-   ##
=======================================
  Coverage   57.17%   57.17%           
=======================================
  Files         104      104           
  Lines        2940     2940           
  Branches      670      670           
=======================================
  Hits         1681     1681           
  Misses       1259     1259           

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[HarelM]

Thanks!