Replace the documentation's Immaterial theme with Furo

[bartfeenstra]

This fixes #1326

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.42%. Comparing base (a05d495) to head (8659b44).
Report is 50 commits behind head on 0.3.x.

Additional details and impacted files

@@           Coverage Diff           @@
##            0.3.x    #1450   +/-   ##
=======================================
  Coverage   95.42%   95.42%           
=======================================
  Files         196      196           
  Lines       18312    18312           
  Branches     2881     2881           
=======================================
  Hits        17474    17474           
  Misses        573      573           
  Partials      265      265           

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