Changes in 2.91.9
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* Added magic image scaling for figures
* Added support for experimental series links
* Fixed previous and next links for DocBook and Mallard
* Enabled syntax highlighting in DocBook
* Changes to html.js and html.css to make them easier to override
* Added editor_mode status badges to linklist links
* Improvements to link filtering with facets
* Prevent key and keyseq from line-wrapping