chore: remove mention of py_proto_library from readme

[shayanhoshyari]

py_proto_library is meant to be imported from protobuf.

#3508 removed the relevant examples. This PR also removes the mention in main readme.

cc: @rickeylev since you authored #3508

[gemini-code-assist]

Summary of Changes

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This pull request focuses on maintaining accurate project documentation by updating the main README.md file. It removes an outdated reference to py_proto_library, ensuring that the repository's overview correctly reflects the current architecture and where users should source this specific library.

Highlights

• Documentation Cleanup: The README.md file has been updated to remove the explicit mention of py_proto_library from the list of core Python rules. This change aligns the documentation with previous updates where py_proto_library examples were removed, as it is intended to be imported from protobuf directly.

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[gemini-code-assist]

Code Review

This pull request correctly removes the mention of py_proto_library from the main README.md file, aligning with its deprecation from rules_python. However, the change is incomplete as another file, docs/index.md, still references py_proto_library in a similar context. To ensure consistency across the project's documentation, please consider also removing the reference from docs/index.md.