Added Port and host information for visualization and interface in environment using docker-compose file

[eshantri]

Fixes #72
In order to test this I tried logging process.env.PORT and process.env.HOST for visualization part and it gives desired output.
For the interface the environment variables are named as REACT_APP_HOST and REACT_APP_PORT.

I have also made the above changes in the visualization/index.js so it can access port and host directly from environment.

[codecov-io]

Codecov Report

Merging #82 (812d6ac) into master (16da1c2) will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master     #82   +/-   ##
======================================
  Coverage    6.53%   6.53%           
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  Files          20      20           
  Lines         597     597           
  Branches       68      68           
======================================
  Hits           39      39           
  Misses        506     506           
  Partials       52      52           

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[im-prakher]

Thanks for good work!