Update CI, add docs generation

[oschulz]

Also rearrange tests.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 53.89%. Comparing base (e28ba17) to head (dd2eaf5).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #142   +/-   ##
=======================================
  Coverage   53.89%   53.89%           
=======================================
  Files          43       43           
  Lines        1221     1221           
=======================================
  Hits          658      658           
  Misses        563      563           

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[github-actions]

Package name	latest	stable
MeasureTheory.jl