add emph to header

docs/template.typ

@@ -38,8 +38,8 @@
   pagebreak()
 
   // Header
-  let show-header(ctx, candidates) = {
-    candidates.body
+  let show-header(ctx, c) = {
+    emph(c.body)
     v(-0.8em)
     line(length: 100%, stroke: 0.5pt)
   }