Create a GitHub Repository that Can Contain Submodules for All Experimental Subjects

[gkapfham]

Right now the AstuteSource organization that houses the GitHub repository for
the chasten tool has forks of other Python projects that all use Poetry for
their dependency management and virtual environment creation.

For example, here is a Python project to which we've already applied chasten:

https://github.com/AstuteSource/pls-cli

It would be ideal if all of the forks of these repositories were added as Git
submodules to a repository called, for instance, chasten-open-source-projects.
This would make it easier for someone who wants to apply chasten to a wide
variety of projects because they would only have to clone one repository and
then the submodules inside of that repository.