Add pyproject.toml

[sdhutchins]

Fixes issue #111

Changes proposed in this pull request:

• Add pyproject.toml
• Fix building docs

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 32.49%. Comparing base (f8d05c3) to head (b637672).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #217   +/-   ##
=======================================
  Coverage   32.49%   32.49%           
=======================================
  Files          69       69           
  Lines        4345     4345           
=======================================
  Hits         1412     1412           
  Misses       2933     2933           

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