More aggressive build ignores
More aggressive build ignores

Summary:
This strips another 8MB from our node_modules.

Checked out the largest individual files in with Disk Inventory X.

{F238464588}

Reviewed By: nikoant

Differential Revision: D21765847

fbshipit-source-id: d74b0eae270b86f0518d7e73288fd773b24535da

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