sub-document rework

docs.typ

@@ -2,9 +2,16 @@
 
 #import "/static/index.typ": stylesheets
 
+#let chapter-title = state("chapter-title", context document.title)
+
 #let docs-page(path, header: auto, footer: auto) = main => document(path, html.html(
   lang: "en_US",
   {
+    context chapter-title.update(old => context {
+      let head = query(heading.where(level: 1).after(here())).first(default: none)
+      return head.body
+    })
+
     html.head({
       html.meta(charset: "utf-8")
       html.meta(name: "viewport", content: "width=device-width, initial-scale=1")
@@ -18,10 +25,9 @@
           context {
             let doc = query(document).first()
             link(doc.location(), doc.title)
+            title(chapter-title.get())
           }
 
-          title()
-
           context {
             let doc = query(selector(document).before(here())).last()
             outline(title: none, target: selector(heading).within(doc.location()))
@@ -47,8 +53,6 @@
         } else {
           header
         })
-
-        divider()
       }
       html.main(main)
       if (footer != none) {