FluidSF: A Python package for calculating turbulent flow statistics

Updates through JOSS review

1. Improved guidelines and assistance for contribution and development (#50, #55, #57, #60, #62)
2. Improved dataset access and UI in example notebooks (#56, #58, #59)
3. Notebook examples compile and run with CI (#56)
4. Small code changes and paper edits (#43, #51, #52, #53, #54)
5. Cleaned up typos and redundancies (#44, #61)

Full Changelog: https://github.com/cassidymwagner/fluidsf/compare/v0.2.0...v0.2.1