MAINT: move/add urls to the appropriate section in pyproject.toml

[theroggy]

Based on https://packaging.python.org/en/latest/guides/writing-pyproject-toml/#urls

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.02%. Comparing base (f074950) to head (561e82a).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #155   +/-   ##
=======================================
  Coverage   91.02%   91.02%           
=======================================
  Files          85       85           
  Lines        6432     6432           
  Branches      628      628           
=======================================
  Hits         5855     5855           
  Misses        545      545           
  Partials       32       32           

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