{#- Full site tree in the left sidebar. pydata-sphinx-theme's stock `sidebar-nav-bs` renders only the *children* of the current top-level page. arda's toctrees are flat lists of top-level pages -- the theme has already put them in the navbar -- so that component emitted a bare "Section Navigation" heading with nothing under it on every page. This renders the whole captioned tree instead, which is what a reader jumping between `samples` and `cluster` actually needs. -#}