Eg in the below screenshot, we can see a significant portion of the left side of the page is unused: <img width="1368" height="830" alt="Screenshot showing wasted vertical space on https://ocaml.github.io/odoc/odoc/odoc.examples/Odoc_examples/Markup/index.html" src="https://github.com/user-attachments/assets/f670eccf-4e5c-458c-998d-e2f068aa5963"> Can we push the left side panel closer to the left margin of the page to make more space for the main content? Eg Elixir library [documentation page](https://hexdocs.pm/elixir/1.18.4/Kernel.html): <img width="1369" height="830" alt="Elixir standard library documentation page" src="https://github.com/user-attachments/assets/dfec74fe-76fb-432e-9d86-c9207dc9947e">