add vertical space between search results heading, excerpt and date

Author: JoelCDL

scss/_searchresult.scss

@@ -8,7 +8,7 @@
     'result-doctype result-datetime'
     / 2.7em 1fr;
   margin-bottom: $space4;
-  column-gap: $space2;
+  gap: $space2;
 
   h2 {
     display: inline-block;