Rename template folder and files in preparation of migration to copier

[lyashevska]

Description

• [x] I have read the contribution guidelines
• [x] This update is in line with what is recommended in the Python chapter of the Guide
• [ ] All user facing changes have been added to CHANGELOG.md

In copier directory_name is not being asked anymore because copier copy source destination generates it. It was replaced by either template to refer to the location or package_name to construct the github links. This means that package_name is now also the name of the repo.

Related issues:

• 403