pex 2.2.1

[github-actions[bot]]

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2.2.1

This release trims down the size of the Pex wheel on PyPI and the
released Pex PEX by about 20KB by consolidating image resources.

This release also fixes the release process to remove a window of time
when several links would be dead at https://docs.pex-tool.org that
pointed to release artifacts that were not yet fully deployed.

• Fix release ordering of the doc site deploy. (Fix release ordering of the doc site deploy. #2369)
• Trim embedded doc image assets. (Trim embedded doc image assets. #2368)

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This discussion was created from the release pex 2.2.1.