3.27.1
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* Massive backwards incompatible updates to stylesheets
* Changed color parameters and added color computations
* Used more HTML5 elements like article, header, footer
* Switched to flexbox for large parts of the layout
* Implemented more granular content centering
* Added stub for sidebars
* Dropped external icons in favor of recolorable inline SVGs
* Removed jQuery
* Switched syntax highlighter to highlight.js
* Dropped experimental Mallard facet support
* Added default colorings for syntax highlighting
* Added a number of new modes and stub templates for customizations
* Updated the section highlighting for location.hash
* Fixed lang:C Mallard test token
* Added support for generic Mallard div element, MEP-0005
* Began adding support for DocBook automatic indexes
* Added support for DocBook stepalternatives and result
* Updated translations:
  ca@valencia.po  (Xavi Ivars)
  da              (Ask Hjorth Larsen)
  en_GB           (Chris Leonard)
  fur             (Fabio Tomat)
  gd              (GunChleoc)
  hr              (gogo)
  kk              (Baurzhan Muftakhidinov)
  ne              (Pawan Chitrakar)
  nl              (hanniedu)
  oc              (Cédric Valmary)
  pl              (Piotr Drąg)
  pl              (Piotr Drąg)
  sl              (Matej Urbančič)