Added top-margin to nested lists (#889)

no issue

- nested lists can become very cramped in post previews, this matches the top margin of the list to what would normally be used in-between list items

app/styles/patterns/global.css

@@ -201,7 +201,7 @@ ol ol,
 ul ul,
 ul ol,
 ol ul {
-    margin: 0 0 0.4em 0;
+    margin: 10px 0 0.4em 0;
     padding-left: 2em;
     font-size: 0.9em;
 }