v0.5.4
Packaging-only release. Fixes the PyPI page so figures actually render, and updates the install instructions to lead with the now-published `pip install zflows`.
README
- Rewrote 7 `<img src="...">` paths from repo-relative (`logo.png`, `tests/*.png`) to absolute `https://raw.githubusercontent.com/xuda-ye-math/zflows/main/...\` URLs. PyPI's Markdown renderer doesn't fetch repo-relative references, so the v0.5.3 PyPI page shipped with broken-image placeholders. Absolute `raw.githubusercontent` URLs work on both GitHub and PyPI — same pattern zuko uses.
- Installation: leads with `pip install zflows` for the released PyPI path; the existing `git clone` + editable-install workflow now follows as the "latest unreleased features + demo scripts on disk" alternative.
No library code changes
`state_dict` keys and runtime behaviour byte-identical to v0.5.3.
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