fixed appendix page header

src/pages/appendix.typ

@@ -1,8 +1,31 @@
+#import "../prelude.typ" as prelude
 
 // ------------------------------------------
 // Appendix setup
 // ------------------------------------------
 
+// function for filtering out all heading which are not of level 1
+#let filter_heading(heading) = {
+  heading.level == 1
+}
+
+#set page(
+  binding: left,
+  header-ascent: 2em,
+  header: locate(loc => {
+    let current_heading = query(selector(heading).after(here())).filter(filter_heading).first()
+    table(columns: (1fr, auto),
+      align: (left, right),
+      stroke: none,
+      inset: (top: 0pt, bottom: 0.5em, left: 0pt, right: 0pt),
+      text(size: prelude.to_pt(prelude.format.font-size))[#current_heading.body],
+      text(size: prelude.to_pt(prelude.format.font-size), counter(page).display("1")),
+      table.hline()
+    )
+  }),
+  footer: ""
+)
+
 #set heading(numbering: none)
 
 = Appendix