Update README.md

Revert "Refactor backend and frontend into same repo on Bucky's request"

Merge pull request #12 from cosmos/greg/refactor

Refactor backend and frontend into same repo on Bucky's request

Merge pull request #11 from cosmos/more-env-vars

readme tweak

update env file usage

make env vars more similar

frontend env fix

tweak env var comment

readme tweak

cleaned up environment variables

set default backend port to 8000

readme fixes

update readme