Normalise heading sizes

Since we added template folders the templates page has had a ‘medium’
sized heading, where other pages have stuck with a ‘large’ size.

This commit rationalises the decision around which pages have which
heading size:
- ‘navigation’ pages (eg templates, team members, email reply to
  addresses) have medium sized headings
- transactional pages (ie ones which have a green button) keep the
  larger heading size

app/assets/stylesheets/components/message.scss

@@ -151,10 +151,6 @@
 
 .folder-heading {
 
-  .column-main>.grid-row:first-child &.heading-medium {
-    margin-top: $gutter-half;
-  }
-
   a,
   &-folder,
   &-subfolder {
@@ -241,6 +237,8 @@
     display: block;
     text-align: right;
     padding: $gutter-two-thirds 0 0 0;
+    position: relative;
+    top: -1px;
   }
 
 }