Add basic print stylesheet

r4ds.scss

@@ -53,3 +53,23 @@ code {
 pre {
   background-image: linear-gradient(160deg,#f8f8f8 0,#f1f1f1 100%);
 }
+
+/* Printing ------------------------------------------------ */
+
+@media print {
+  :root {
+    font-size: 11pt;
+  }
+  #quarto-sidebar, #TOC, .nav-page {
+    display: none;
+  }
+  .page-columns .content {
+    grid-column-start: page-start;
+  }
+  .fixed-top {
+    position: relative;
+  }
+  .panel-caption, .figure-caption, figcaption {
+    color: #666;
+  }
+}