fix(markdown): Add margin for all new paragraphs

Before this only `<p>` elements had some top margin applied,
but blocks like code blocks (`pre`) would not have any margin and
were rendered like if they belong to the previous paragraph.

Signed-off-by: Ferdinand Thiessen <rpm@fthiessen.de>

src/scssmixins/markdownOutput.scss

@@ -22,7 +22,7 @@
 
 @mixin markdown-output {
 	::v-deep {
-		p:not(:first-child) {
+		>:not(:first-child) {
 			margin-top: 1.5em;
 		}
 	}