Prevent top margin for first element in markdown/wiki/readme typography

app/assets/stylesheets/gitlab_bootstrap/mixins.scss

@@ -76,6 +76,10 @@
 }
 @mixin md-typography {
+  *:first-child {
+    margin-top: 0;
+  }
+
   code { padding: 0 4px; }
   h1 { margin-top: 30px;}
   h2 { margin-top: 25px;}

app/assets/stylesheets/gitlab_bootstrap/typography.scss

@@ -94,12 +94,16 @@ a:focus {
  *
  */
 .wiki {
-  font-size: 14px;
-  line-height: 1.6;
   @include md-typography;
-  .white .highlight pre { background: #f5f5f5; }
-  ul { margin: 0 0 9px 25px !important; }
+  font-size: 14px;
+  line-height: 1.6;
+  .white .highlight pre {
+    background: #f5f5f5;
+  }
+  ul {
+    margin: 0 0 9px 25px !important;
+  }
 }
 .md {