Fix paperwork acquiring extra line breaks when you change register (#12652)

* Move paradise-specific customization of marked.js to separate file.

This makes marked.js easily updatable from upstream if need be.

* Fix extra paragraphs being inserted when doing paperwork

code/modules/paperwork/paper.dm

@@ -87,6 +87,7 @@
 		popup.set_content(data)
 		if(!stars)
 			popup.add_script("marked.js", 'html/browser/marked.js')
+			popup.add_script("marked-paradise.js", 'html/browser/marked-paradise.js')
 		popup.add_head_content("<title>[name]</title>")
 		popup.open()
 	return data