fixes #7140: hide navbar toggle in print

docs/assets/css/bootstrap.css

@@ -263,6 +263,9 @@ table {
   h3 {
     page-break-after: avoid;
   }
+  .navbar-toggle {
+    display: none;
+  }
 }
 
 * {

less/print.less

@@ -66,4 +66,9 @@
   h3 {
     page-break-after: avoid;
   }
+
+  // Bootstrap components
+  .navbar-toggle {
+    display: none;
+  }
 }