Print tweaks (#25164)

* Add min-width to body when printing

This should address some inconsistencies between browsers when printing. It applies a min-width to the body so that the content better resembles what your might see on your screen. I've made it a variable for easy customizing, too.

* Don't underline buttons when printing

* Add basic print styles for page and body size to create a semi-consistent print experience across browsers

scss/_variables.scss

@@ -882,3 +882,8 @@ $kbd-bg:                            $gray-900 !default;
 
 $pre-color:                         $gray-900 !default;
 $pre-scrollable-max-height:         340px !default;
+
+
+// Printing
+$print-page-size:                   a3 !default;
+$print-body-min-width:              map-get($grid-breakpoints, "lg") !default;