Remove sidebar, flash container, and URLs from print pages

app/assets/stylesheets/print.scss

@@ -36,7 +36,9 @@ ul.notes-form,
 .gutter-toggle,
 .issuable-details .content-block-small,
 .edit-link,
-.note-action-button {
+.note-action-button,
+.right-sidebar,
+.flash-container {
   display: none !important;
 }
 
@@ -53,3 +55,7 @@ pre {
 .right-sidebar {
   top: 0;
 }
+
+a[href]::after {
+  content: none !important;
+}

changelogs/unreleased/23465-print-markdown.yml

+---
+title: Fix print styles for markdown pages
+merge_request:
+author:
+type: fixed