Mark stale docs at top-level with warning banner #25
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Here's another horrifying (but orthogonal) script-generated commit, building upon 'cleanup.py' (-> 'cleanup.ipynb'). It deprecates any HTML in the following folders which doesn't appear in the (given, in this case '2.2.2') current release.
'Deprecation' means putting a sticky red banner in, with a suggested search string. Bots are not forwarded (via rel='canonical') because we don't know where the content went. Even if the page has obviously just been refiled (e.g. tight layout guide), we punt to the search engine to do the fuzzy match.
Stale .py or .pdf (but not .png, e.g. in _images) files found in top-level (unversioned) docs are removed. This does break outdated examples' 'Source code' links. (Also, we could check HTML title elements for the outdated version string.)
Edit: Oops, rerunning the script not only stacks 'unreleased-message' banners but is its main use case, fixing tomorrow. Will alias the style ('stale-docs-message') too.