Easylink

- Move test dictionaries to yaml files

- Fix handling of templated steps when no looping or parallelism is requested

- Implement duplicate_template_step method on TemplatedStep class

- Validate currently-installed python version during setup
- Automatically update README when supported python versions change
- Automatically extract github actions supported python version test matrix

- Add optional arg to pass allowable schemas to the Config constructor
- Initial documentation publication

- Implement pipeline choice sections