Remove nvmrc file

[natebass]

Pull request 25 (https://github.com/code4sac/sacramento-campaign-finance/pull/25) adds tabler as an npm dependency. It requires node v18, whereas our application nvmrc specified v16.

npm WARN EBADENGINE Unsupported engine {
npm WARN EBADENGINE   package: '@tabler/core@1.0.0-beta20',
npm WARN EBADENGINE   required: { node: '>=18' },
npm WARN EBADENGINE   current: { node: 'v16.20.1', npm: '8.19.4' }
npm WARN EBADENGINE }

I think we should remove the .nvmrc file to increase simplicity of the file structure. We could also update the file to a more recent version of node.

Let me know what you all think. Thanks.

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[natebass]

OK, sounds good.

I updated the file to Node 18.

[jeremiak]

Nice! Refs #26