🔧 MAINTAIN: Move from setuptools to flit

[chrisjsewell]

No description provided.

[codecov]

Codecov Report

Merging #208 (7417c3e) into master (7748e13) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #208   +/-   ##
=======================================
  Coverage   96.14%   96.14%           
=======================================
  Files          61       61           
  Lines        3244     3244           
=======================================
  Hits         3119     3119           
  Misses        125      125           

Flag	Coverage Δ
pytests	96.14% <ø> (ø)

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Impacted Files	Coverage Δ
markdown_it/token.py	90.52% <ø> (ø)
markdown_it/tree.py	91.61% <ø> (ø)

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