Nix flake

[aciceri]

This is related to https://github.com/mlabs-haskell/seabug/pull/19.

• the flake exports a default package that is the build folder created by npm run start.
• the checks are the node package dependencies. TODO: create a new check that runs craco test
• created an empty script as nix default app. TODO: start a local server with the react app using Nginx or npm run start

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[aciceri]

@nrutledge why was this never merged?

PS: I'm making this PR a draft since I was thinking to also add the NixOS module with nginx here (the one that will be imported from seabug)