Include almost all source files in sdist (#482)

[charles-dyfis-net]

Presently, the sdist published to pypi cannot be built (failing as shown in #482), because hatch-fancy-pypi-readme is configured to read README.md but that file is not included in the source distribution.

Here we make the sdist almost all-inclusive (differing from git archive output only by leaving out only hidden files and directories -- presently .github, .devcontainers, .python-version, and .stats.yml).

[rattrayalex]

Thanks for the suggestion/contribution, we'll take a look!

[rattrayalex]

thanks for the suggestion/contribution, this change has been incorporated!