pex 2.1.164

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2.1.164

This release moves Pex documentation from https://pex.readthedocs.io to
https://docs.pex-tool.org. While legacy versioned docs will remain
available at RTD in perpetuity, going forward only the latest Pex
release docs will be available online at the https://docs.pex-tool.org
site. If you want to see the Pex docs for the version you are currently
using, Pex now supports the pex3 docs command which will serve the
docs for your Pex version locally, offline, but with full functionality,
including search.

• Re-work Pex documentation. (#2362)