docs(design): actually write some content

docs/template.typ

@@ -15,6 +15,7 @@
 ) = {
 	set page(
 		numbering: "1 / 1",
+    margin: 3.25cm,
 		header: locate(loc => {
 			datetime.today().display()
 
@@ -29,6 +30,17 @@
 	set heading(numbering: "A.1")
 
 	show heading: it => text(..fonts.heading, it)
+  show raw.where(block: true): box.with(
+    fill: luma(95%),
+    inset: 1.25em,
+    radius: 0.75em,
+    width: 45em,
+  )
+  show raw.where(block: false): box.with(
+    fill: luma(95%),
+    outset: 0.25em,
+    radius: 0.25em,
+  )
 
 	// document title
 	if title != none {