feat(print): better widows & orphans support

src/public/stylesheets/print.css

@@ -213,4 +213,18 @@ span[style] {
 .note-detail-printable .footnote-reference a,
 .footnote-back-link a {
     text-decoration: none;
- }
+ }
+
+/*
+ * Widows and orphans
+ */
+p,
+blockquote {
+    widows: 4;
+    orphans: 4;
+}
+
+pre > code {
+    widows: 6;
+    orphans: 6;
+}