{#- 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. Most pages here are top-level siblings the theme has already put in the navbar, so that component emits a bare "Section Navigation" heading with nothing under it -- scenery, not navigation. This renders the whole captioned tree instead, which is what a reader moving between `signature` and `usage` actually needs. Same template as `seqtree` and `mhcmatch`, whose docs these are being brought into line with. -#}