{#- 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 of this project's pages are top-level siblings that the theme has already put in the navbar, so that component emitted a bare "Section Navigation" heading with nothing under it -- which is scenery, not navigation. This renders the whole captioned tree instead, which is what a reader moving between `neoantigen` and `cassette` actually needs. Adapted from the same template in `seqtree`, whose docs this project's are being brought into line with. -#}