mangle pages some more

Harald Sitterrequested to merge
work/sitter/mangle into master

ran pages through mangler logic of https://invent.kde.org/sitter/forum-kde-org-freeze

among other things:

  • adding a deprecation header
  • removing bookmarks
  • removing navbars
  • removing excess pages from header
  • removing excessively large albeit empty headerbar
  • removing broken hrefs

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