README: install routes (pip/apt/venv) + screenshot

Document three ways to get the dependencies since Debian's system pip is locked
down (PEP 668 externally-managed-environment): pip, apt (no pip), or a venv, with
the note that `python3 -m lintunes.main` runs the app without pip or the
`lintunes` command at all. Make the second-machine steps install-agnostic and add
the app screenshot.
This commit is contained in:
2026-07-01 21:51:48 -04:00
parent bc8386c186
commit 765448f5c5
2 changed files with 51 additions and 29 deletions
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