[hotfix] change default requirements to production requirements

[Croydon-Brixton]

Todo:

• Fix dependency versions in requirements.txt
• Clean up requirements folder (should only have environment.yaml and production reqirements)
• Verify correct installation with fixed dependencies

[herbiebradley]

Feel free to merge - we're figuring out the right dependencies with rasterio in #81. I also want to include matplotlib and seaborn in the requirements.txt, but probably simpler to include that in the above PR rather than this one.

[Croydon-Brixton]

Fixed binder and requirements jungle 😉

✅ Requirement pins were tested successfully, both on MacOS & Ubuntu
✅ Resolves #83

[rdnfn]

Thanks Simon for all this work! Very good to have all of these requirements updated. I know this stuff takes a lot of work, so your contribution is much appreciated!