Refactored documentation

[tclose]

Refactors and extends documentation to cover fields, classifiers and mime types

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 92.61%. Comparing base (356d464) to head (3665d06).
Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
fileformats/core/field.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #70      +/-   ##
==========================================
- Coverage   92.63%   92.61%   -0.02%     
==========================================
  Files          45       45              
  Lines        4915     4917       +2     
  Branches      547      547              
==========================================
+ Hits         4553     4554       +1     
- Misses        272      273       +1     
  Partials       90       90              

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