This might be a little bit late, but I’ll still drop my opinion here.
Sidebar / Navigation
The sidebar shows a list way to long for my brain, so I completely ignore it as it’s useless and a waste of time to search through it.
The sidebar should show a hierarchy of the current page I’m reading on. So please show all the parent and greatparents and so on of the current page). I’d also like to see all other pages that are in the same hierarchy level as the current topic, as they might be related. This would be a good way to find more information in the same section as the current page. All other pages that are not (yet) relevant to me, shouldn’t shown, their parents however should be. (e.g. if I’m reading the page about “background processes” I don’t care for “troubleshooting in Haskell”, but seeing that there’s some “Troubleshooting” section would still be nice, because I might need that in the future?).
I’d also like to see the search in the sidebar, as this would be a good place to show results. This is strongly a personal preference as I generally don’t trust other searches than my main search provider.
The content is more or less good structured. Search bar is not doing what I expect, as the position implies it’s for searching through the current page but it’s actually a global search. (and who was so insane to show all search results?!) “Help make this document better” is really annoying and way to big.
Kill the search field. It doesn’t search the content of the page, so don’t tie it to the content. This is misleading and it doesn’t help my trust issues with searches at all. Also I’d like to see a table of content at the top of the page. This would help a lot to navigate through long pages like Configuring CircleCI. Please make this “Help make this document better” footer smaller. A simple “Improve this site: (Open Issue) (Suggest Edit) (View on GitHub)” should be sufficient. The license footer is too big as well, a simple hyperlink to the license should be a improvement.