a clean-up plugin, to keep dest dir synced only to ikiwiki generates files

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+By default, IkiWiki will leave any existing files in the destination directory alone.
+
+In some circumstances (a force push being one), files that IkiWiki did once generate can be left behind in the destination directory if it no longer does.
+
+Since IkiWiki generates a list of all destination file paths that it is responsible for, a plugin (armed with that knowledge) could identify the files it *isn't* responsible for, too, and clean them up. This would be useful if the user wishes to keep a 1:1 correspondence between source and destination directories.
+ *—[[Jon]], 2021-02-07*