docs: setup mkdocs-material

[hadrien]

Problem

• There is no documentation which does not make the project appealing.

Solution

• Setup mkdocs-material
• Document :all-the-things:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (4e58835) to head (b0c0516).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #13   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           93        95    +2     
  Branches         6         6           
=========================================
+ Hits            93        95    +2     

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