It really doesn't work for me. Here is why: A big part of manuals is being able to read or scroll fluidly into the next or previous section - very often one do

It really doesn't work for me. Here is why: A big part of manuals is being able to read or scroll fluidly into the next or previous section - very often one doesn't know whether what they are looking for is mentioned in 1.3.1 or 1.3.2 - having to manually click each section is completely atrocious for usability. Not to mention you just broke search. If you want a responsive design that's actually useful as opposed to counterproductive, leave the sidebar for navigation (down-scale it to 50% it's huge and distracting) and restore the document to a contiguous form. There is a reason manuals have been written the way they are for dozens of years, hip and flashy design elements might sell products - but they do not help with productivity.