Rewrites `README.md` from scratch for #135. Every statement was checked against the code on `next` and against what the built binary prints on small trees under `/var/tmp`. The headings that the code comments cite are kept. Five `main_test.go` comments cite "Settings", two cite what "Error handling" says about a failed write to stdout, and one comment each in `scan_test.go`, `trees_test.go` and `exclude_test.go` cites what the README now says. Where the old text and the repository disagreed, the new text states what the code does: `@latest` installs the newest tagged release, ten million files in both "Rationale" and "Design", no Windows excludes, and an operand reached through a symlinked directory below another operand is dropped (#144). Model: fable-5-1
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