Release prep (#727)

* Rewrite README to reflect current conditions.

* More updates.

* Incorporating Barbara and Kurt's suggestions.

ugh, github

Potential v0.5.1 PyPi release (#347)

* A candidate for the v0.5 pypi release; added metadata to pyproject.toml; limited python versions to 3.10 variants (until we can include a version of modelbench that supports higher); updated readme with new options

* A candidate for the v0.5.1 pypi release; works with pythons from 3.10 to 3.12.