add stopgap http server with mime types from python

[bollwyvl]

References

• fixes Serve wasm file with the application/wasm mime type #59

Code changes

• drops http.server
• add scripts/serve.js
  • not in-tree, because we can't ship this trash
  • mostly derived from, and may need better attribution to:
    • MDN
    • cpython

User-facing changes

• n/a

Backwards-incompatible changes

• uses env vars instead of parsing argv 🤷
• sets them both to bind to 127.0.0.1 because it's literally the least we can do

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[jtpio]

Thanks!