Start with a redesign of the entire site
I did away with the leaves header on every page, but the leaves are now featured much more prominently on the home page. The remainder of the pages just contains a nicely coloured header. Also, some pages now have TOCs with Bootstrap scrollspies (although the contents of the TOC still need to be generated automatically - at the moment they are hard-coded). At the moment I only changed the English locale, so the other language versions are terribly broken. The English one is also broken in quite some places, but not terribly so.