[PyOxidizer] Remove from repo

[sureshjoshi]

All of my binaries going forward will use Scies (which use IndyGreg's PythonBuildStandalone under the hood).

PyOx just takes far too long to run and is more finicky than I would like for a Python bundling solution. So far, scie has solved my Python executable grief (and is the preferred method for pants installation.

As a result, I'll remove the examples from the code - but keep a link to the last commit with them.