docs: remove personal paths and false co-authorship before releaseHEADmain

The repo carries an open task to publish it, and docs/ leaked things a clone
could neither use nor should see.

Absolute paths under one user's home become the repo root, a home-relative
path, or a named variable, so the snippets stay runnable for anyone. The
testinfra example takes its user from an env var instead of hardcoding one.

References into a private sibling project and into the gitignored tooling
directory are replaced by what they mean; as written they were dead links in
any clone but the author's.

Five documents claimed a co-author who is not a person. An #+AUTHOR line
survives conversion into docx, a wiki page, or a PDF, so it is worth being
exact about: these documents have one author.

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