Add permalinks and collapsible navigation to handbook
Most of the read-the-docs I'm used to have much better linking and navigation support, e.g., PeeWee:
- If you hover over a heading (at any level) you get a permalink icon. For the current handbook, if you want to link to a section you have use inspector or page source to get the id and fashion a URL yourself.
- The are lots of deep sub sections and it can be hard to navigate to. The collapsible navigation feature gives much finer access and discoverability.
Would MR this, but I don't have enough infrastructure visibility to see how the current handbook is configured.