Resolve "Nodejs 17 breaks webpack 5"

Hugo Kerstensrequested to merge
667-nodejs17-broken into master

This MR fixes nodejs 17+ compatibility:

  • Use the xxhash64 algorithm, as md4 is no longer available.
  • Use the webpack5 entrypoint for react-pdf, since the legacy entrypoint used md4 hashing.
    • Adds a polyfill for buffer, as it is not provided by nodejs 17.
  • Changes the proxy url to 127.0.0.1, as localhost can default to [::1] (ipv6) in nodejs 17+

Closes #667 (closed)

Edited by Hugo Kerstens

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