chore: remove shell.nix in favour of flakes

[pyranota]

Important

Remove shell.nix and update .envrc to use flake for environment management.

• Environment Management:
  • Remove shell.nix file, eliminating the previous Nix environment setup.
  • Update .envrc to use flake instead of nix, indicating a switch to Nix Flakes.

^{This description was created by for d45cbb1. It will automatically update as commits are pushed.}

[ellipsis-dev]

👍 Looks good to me! Reviewed everything up to d45cbb1 in 10 seconds

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1. .envrc:1

• Draft comment:
  Ensure that all dependencies and configurations are compatible with the use of flakes, as this change might affect how the environment is set up.
• Reason this comment was not posted:
  Confidence changes required: 50%
  The change from 'use nix' to 'use flake' in .envrc is appropriate given the PR's intent to switch to flakes. However, it's important to ensure that the rest of the environment setup is compatible with this change.

Workflow ID: wflow_7oiKwCLgPcg6CJSJ

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