add direnv nix config

[nbsp]

just a small thing for my Nixing purposes. automatically loads the flake instead of me having to run nix develop<ENTER>zsh<ENTER> every time i enter this directory

[changeset-bot[bot]]

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Latest commit: 2fde13e85181280835b28149b3871ec6a1fd6347

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[lukasIO]

I'll close this for now as part of some PR cleanup, feel free to reopen if that's still important to you