neovim(nvf): support standalone configurations

[DrymarchonShaun]

Description

When using nixvim in standalone mode, you can pass config.stylix.targets.nixvim.exportedModule to the nixvim-generated neovim package to apply theming.

nvf has a similar standalone mode, would it be possible to expose the generated configuration in a similar way so it can be passed into the nvf-generated neovim package?

Submission Checklist

• I assert that this issue is relevant to Stylix
• I assert that this is not a duplicate of an existing issue

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@butzist @mightyiam @trueNAHO

[trueNAHO]

When using nixvim in standalone mode, you can pass config.stylix.targets.nixvim.exportedModule to the nixvim-generated neovim package to apply theming.

nvf has a similar standalone mode, would it be possible to expose the generated configuration in a similar way so it can be passed into the nvf-generated neovim package?

Feel free to submit a PR. It should be very similar to commit e7c09d2 ("nixvim: expose config for nixvim's standalone mode (#415)"), except that it should also add /modules/neovim/testbeds/nvf-{integrated,standalone}.nix testbeds.