Fix imports

[Xiot]

Change the import paths so they no longer look like node_module imports.
Project relative can still be done, but using the ~/ prefix.

[Xiot]

Checked that react-vis builds cleanly, and that showcase and storybook both spin up.

[Xiot]

I'll remove the codemods directory before I merge, but I left them in there for now so you can see how I changed everything.

[CLAassistant]

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