refactor: improve overall repo structure

[AngryMaciek]

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have not reduced the existing code coverage

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[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (61ddc88) 100.00% compared to head (9f4fb2a) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master       #61   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines          893       893           
=========================================
  Hits           893       893           

Files Changed	Coverage Δ
hypercomplex/Hypercomplex.hpp	100.00% <ø> (ø)
hypercomplex/Polynomial.hpp	100.00% <ø> (ø)

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