remove unmaintained nix files

[Adam-D-Lewis]

Reference Issues or PRs

Nix dev environment is unmaintained and can't be used without some effort to fix the nix files. Since none of the Nebari developers are actively using it, I propose we remove these broken files.

What does this implement/fix?

Put a x in the boxes that apply

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds a feature)
• Breaking change (fix or feature that would cause existing features not to work as expected)
• Documentation Update
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Build related changes
• Other (please describe): Remove unmaintained Nix dev environment

Testing

• Did you test the pull request locally?
• Did you add new tests?

How to test this PR?

Any other comments?

[marcelovilla]

Thanks @Adam-D-Lewis. I've always seen those files lingering around and I guess it's true nobody is actually using them.