Consider converting react-seed into a template

People who want to get started in building PatternFly UIs are encouraged to fork this seed repository as a starting point for their development, however repository forking was not intended for this purpose and thus doing it this way creates some annoyances for downstream developers:

• The new repository can only be public because the source being forked is public

• There is an existing git commit history that is not relevant to the project being developed

This means that users who want to bypass this will most likely simply clone the repository and push into a new one which is annoying/time consuming.

GitHub provides a feature known as template repositories [1] which makes these annoyances moot, users who create new repositories off of a template will start with a blank git commit history and are free to choose between public and private visibility for the generated repository.

[1] https://docs.github.com/en/repositories/creating-and-managing-repositories/creating-a-template-repository

Jira Issue: PF-2031

No source files or tests are identified in the issue. Start by reviewing the repository's GitHub template-repository setting and the seed's onboarding guidance; done means users can create a new repository from it with a blank history and either public or private visibility.