refactor: move cmd package outside root

[aldy505]

Closes #46

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6af8e38) 31.72% compared to head (303f100) 31.65%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #47      +/-   ##
==========================================
- Coverage   31.72%   31.65%   -0.07%     
==========================================
  Files          21       21              
  Lines        1447     1447              
==========================================
- Hits          459      458       -1     
- Misses        897      898       +1     
  Partials       91       91              

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