Help topics: improve placement

Recently, I moved help topics to a sub-optimal (but absolutely fine for now) placement in the pages in order to allow prioritize responsive display of the pages. Previously, the help topics had a great placement for wide/desktop viewports, but when sized down for narrow desktop/tablet, the help topic column ruined the rest of the content placement due to limited horizontal space.

For now, the help topics appear at the bottom of the admin page navigation sidebar, but this is often low down on the page or at the bottom most part of the page. It would be a good idea to find an option here that straddled the two options. This is very low priority though.

Some possibilities:

• Use a rail ^1 on desktop displays for the third column. This puts placement outside the main content bounds, but does take some extra fiddling to avoid collapsing the column in between desktop and tablet viewport sizes. I haven't used this element yet because of this.
• Bring back the third column and only show it on desktop viewports. This requires duplicating the help topics block in two places, one visible only on desktop, one only visible on not desktop.
• I'm less a fan of this option for links to our docs, but do like this option for hiding paragraph content (as users do not read UI copy anyways). Do something like Cloudflare and put more help under a dropdown:

Start by reviewing the current help-topic placement in the admin page navigation sidebar across desktop, tablet, and narrow viewports. Compare the proposed rail, desktop-only third column, and dropdown approaches; done means an agreed responsive placement that preserves the surrounding page layout.