fix(web): Webpack warning about require.extensions not being supported

[gabrielmfern]

The issue was that we were importing traverse from @babel/core which
handled .babelrc config loading automatically which would use some Node
features unsupported by Webpack, like require.extensions. What this PR does
is simply change the place we import traverse from to be @babel/traverse
and uninstall @babel/core for simplicity's sake.

[changeset-bot]

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Latest commit: 4d8113d

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