docs: clarify install and release flow

[Ker102]

Summary

• clarify install-from-source workflow versus running the CLI
• document why python -m nullstate is a fallback when nullstate is not on PATH
• add release tag guidance for v0.1.0-alpha.1, beta, and final hackathon release

Verification

• git diff --check origin/main...HEAD
• python -m nullstate --help

Notes

PR #10 was already merged by the maintainer. This PR only carries the install/release README clarification.

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Reviewing files that changed from the base of the PR and between 51d88a6 and 53f7b0a.

📒 Files selected for processing (1)

• README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/install-release-flow

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