Make sphinx-docs-starter-pack a template repository.

[xypron]

Please, convert this project to be a template repository shown in https://github.com/orgs/canonical/repositories?q=template%3Atrue.

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

[SecondSkoll]

This project is not intended to be a template for documentation projects at this time. The workflow as it currently is implemented is to download the init.sh script and run it locally.

[rkratky]

@SecondSkoll Weren't we talking about getting rid of the script at some point though?