Reduce spacing around h3 in search results

src/less/website/search.less

@@ -3,6 +3,11 @@
     .search-results {
         .has-results {
             .gitbook-markdown(@md-color: @content-color, @md-line-height: @content-line-height);
+
+            .search-results-item h3 {
+                margin-top: 0px;
+                margin-bottom: 0px;
+            }
         }
     }
 }