Fastafurious

- Minor fixes to publish (CD) behaviour for PyPi: publish only on published releases

- Fixes to PyPi publish (CD)
- Edits to README to match PyPi

- Edits to versions for PyPi publish (CD)
- Add option to print FASTAfurious version then exit
- Simple pytest for above module

- Addition of CD deployment to PyPi on published release

- Addition of pytest modules and Github Actions (CI/CD) workflow
- Use of long description for PyPi distribution
- minor spelling and README edits