docs: README prose pass, em dashes to plain punctuation

[Mhemd139]

Follow-up that missed the #10 merge window by a minute: replaces the README's 18 prose em dashes with commas, colons, semicolons, and parentheses (the lone survivor is the layers table's "none" placeholder, which is a table convention). Also bumps the stale docker build image tag in the k8s snippet to 0.1.1.

Docs-only.

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Reviewing files that changed from the base of the PR and between 040c682 and c421a56.

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• README.md

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• Create PR with unit tests
• Commit unit tests in branch docs/emdash-pass

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