Rename PyZPK to PyZKP

[madhavajay]

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What?

Rename the repo and package name, plus docs.

Why?

It seems that the better way to phrase / write the name is Zero-knowledge Proofs so to avoid future confusion this could be renamed.

Breakdown

• Rename the repo from PyZPK to PyZKP
• Rename all doc references to the acronym PyZPK to PyZKP
• Rename all full worded names as well.
• Create an alias on PyPI to the old package name to smooth the transition