regenerate updated documentation for 2.8.4

Charlotte Hausmanrequested to merge
update-docs-2.8.4 into 2.8.4-DEVELOPMENT

Wow, we haven't run this in ages.... sigh

  • updated sphinx doc generation to look for pyproject.toml rather than setup.py
  • removed 'ingest' pex from documentation as this is no longer maintained in WS
  • pulled in several go utilities

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