docs(template): make outline rendering configurable

docs/design/util/graphics.typ

@@ -248,7 +248,7 @@
 
 // literally just for standalone display of the graphics alone
 #import "../../template.typ": conf
-#show: conf
+#show: conf.with(render-outline: false)
 #set page(width: auto, height: auto)
 
 #graph-example

docs/template.typ

@@ -56,6 +56,7 @@
 #let conf(
   title: none,
   subtitle: none,
+  render-outline: true,
   doc,
 ) = {
   set page(
@@ -134,6 +135,7 @@
   }
 
   // outline and other prelude info
+  if render-outline {
     outline(
       indent: auto,
       fill: line(
@@ -146,6 +148,7 @@
         ),
       ),
     )
+  }
 
   // content itself
   doc